diff --git a/src/panels/config/automation/ha-automation-editor.ts b/src/panels/config/automation/ha-automation-editor.ts
index ebd10a0cd4..a5b93a7d67 100644
--- a/src/panels/config/automation/ha-automation-editor.ts
+++ b/src/panels/config/automation/ha-automation-editor.ts
@@ -1154,6 +1154,12 @@ export class HaAutomationEditor extends PreventUnsavedMixin(
     return [
       haStyle,
       css`
+        :host {
+          --ha-automation-editor-max-width: var(
+            --ha-automation-editor-width,
+            1540px
+          );
+        }
         ha-fade-in {
           display: flex;
           justify-content: center;
@@ -1175,7 +1181,7 @@ export class HaAutomationEditor extends PreventUnsavedMixin(
         }
 
         manual-automation-editor {
-          max-width: 1540px;
+          max-width: var(--ha-automation-editor-max-width);
           padding: 0 12px;
         }
 
diff --git a/src/panels/config/automation/ha-automation-sidebar.ts b/src/panels/config/automation/ha-automation-sidebar.ts
index 4a51370660..bdb4e1ed50 100644
--- a/src/panels/config/automation/ha-automation-sidebar.ts
+++ b/src/panels/config/automation/ha-automation-sidebar.ts
@@ -1,5 +1,7 @@
 import { css, html, LitElement, nothing } from "lit";
 import { customElement, property, query, state } from "lit/decorators";
+import { fireEvent } from "../../../common/dom/fire_event";
+import { computeRTL } from "../../../common/util/compute_rtl";
 import "../../../components/ha-resizable-bottom-sheet";
 import type { HaResizableBottomSheet } from "../../../components/ha-resizable-bottom-sheet";
 import {
@@ -37,9 +39,18 @@ export default class HaAutomationSidebar extends LitElement {
 
   @state() private _yamlMode = false;
 
+  @state() private _resizing = false;
+
   @query("ha-resizable-bottom-sheet")
   private _bottomSheetElement?: HaResizableBottomSheet;
 
+  private _resizeStartX = 0;
+
+  disconnectedCallback() {
+    super.disconnectedCallback();
+    this._unregisterResizeHandlers();
+  }
+
   private _renderContent() {
     // get config type
     const type = this._getType();
@@ -154,7 +165,16 @@ export default class HaAutomationSidebar extends LitElement {
       `;
     }
 
-    return this._renderContent();
+    return html`
+      <div
+        class="handle ${this._resizing ? "resizing" : ""}"
+        @mousedown=${this._handleMouseDown}
+        @touchstart=${this._handleMouseDown}
+      >
+        ${this._resizing ? html`<div class="indicator"></div>` : nothing}
+      </div>
+      ${this._renderContent()}
+    `;
   }
 
   private _getType() {
@@ -207,6 +227,67 @@ export default class HaAutomationSidebar extends LitElement {
     (this.config as ActionSidebarConfig)?.toggleYamlMode();
   };
 
+  private _handleMouseDown = (ev: MouseEvent | TouchEvent) => {
+    // Prevent the browser from interpreting this as a scroll/PTR gesture.
+    ev.preventDefault();
+    this._startResizing(
+      (ev as TouchEvent).touches?.length
+        ? (ev as TouchEvent).touches[0].clientX
+        : (ev as MouseEvent).clientX
+    );
+  };
+
+  private _startResizing(clientX: number) {
+    // register event listeners for drag handling
+    document.addEventListener("mousemove", this._handleMouseMove);
+    document.addEventListener("mouseup", this._endResizing);
+    document.addEventListener("touchmove", this._handleMouseMove, {
+      passive: false,
+    });
+    document.addEventListener("touchend", this._endResizing);
+    document.addEventListener("touchcancel", this._endResizing);
+
+    this._resizing = true;
+    this._resizeStartX = clientX;
+  }
+
+  private _handleMouseMove = (ev: MouseEvent | TouchEvent) => {
+    this._updateSize(
+      (ev as TouchEvent).touches?.length
+        ? (ev as TouchEvent).touches[0].clientX
+        : (ev as MouseEvent).clientX
+    );
+  };
+
+  private _updateSize(clientX: number) {
+    let delta = this._resizeStartX - clientX;
+
+    if (computeRTL(this.hass)) {
+      delta = -delta;
+    }
+
+    requestAnimationFrame(() => {
+      fireEvent(this, "sidebar-resized", {
+        deltaInPx: delta,
+      });
+    });
+  }
+
+  private _endResizing = () => {
+    this._unregisterResizeHandlers();
+    this._resizing = false;
+    document.body.style.removeProperty("cursor");
+    fireEvent(this, "sidebar-resizing-stopped");
+  };
+
+  private _unregisterResizeHandlers() {
+    document.removeEventListener("mousemove", this._handleMouseMove);
+    document.removeEventListener("mouseup", this._endResizing);
+    document.removeEventListener("touchmove", this._handleMouseMove);
+    document.removeEventListener("touchend", this._endResizing);
+    document.removeEventListener("touchcancel", this._endResizing);
+  }
+
   static styles = css`
     :host {
       z-index: 6;
@@ -231,6 +312,28 @@ export default class HaAutomationSidebar extends LitElement {
         max-height: 100%;
       }
     }
+
+    .handle {
+      position: absolute;
+      margin-inline-start: -11px;
+      height: calc(100% - (2 * var(--ha-card-border-radius)));
+      width: 24px;
+      z-index: 7;
+      cursor: ew-resize;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      padding: var(--ha-card-border-radius) 0;
+    }
+    .handle.resizing {
+      cursor: grabbing;
+    }
+    .handle .indicator {
+      background-color: var(--primary-color);
+      height: 100%;
+      width: 4px;
+      border-radius: var(--ha-border-radius-pill);
+    }
   `;
 }
 
@@ -244,5 +347,9 @@ declare global {
     "yaml-changed": {
       value: unknown;
     };
+    "sidebar-resized": {
+      deltaInPx: number;
+    };
+    "sidebar-resizing-stopped": undefined;
   }
 }
diff --git a/src/panels/config/automation/manual-automation-editor.ts b/src/panels/config/automation/manual-automation-editor.ts
index 55b9a52cbf..724675da61 100644
--- a/src/panels/config/automation/manual-automation-editor.ts
+++ b/src/panels/config/automation/manual-automation-editor.ts
@@ -22,6 +22,7 @@ import {
   union,
 } from "superstruct";
 import { ensureArray } from "../../../common/array/ensure-array";
+import { storage } from "../../../common/decorators/storage";
 import { canOverrideAlphanumericInput } from "../../../common/dom/can-override-input";
 import { fireEvent } from "../../../common/dom/fire_event";
 import { constructUrlCurrentPath } from "../../../common/url/construct-url";
@@ -77,6 +78,8 @@ const automationConfigStruct = union([
   assign(baseConfigStruct, object({ actions: array(any()) })),
 ]);
 
+export const SIDEBAR_DEFAULT_WIDTH = 500;
+
 @customElement("manual-automation-editor")
 export class HaManualAutomationEditor extends LitElement {
   @property({ attribute: false }) public hass!: HomeAssistant;
@@ -101,6 +104,13 @@ export class HaManualAutomationEditor extends LitElement {
 
   @state() private _sidebarKey?: string;
 
+  @storage({
+    key: "automation-sidebar-width",
+    state: false,
+    subscribe: false,
+  })
+  private _sidebarWidthPx = SIDEBAR_DEFAULT_WIDTH;
+
   @query("ha-automation-sidebar") private _sidebarElement?: HaAutomationSidebar;
 
   @queryAll("ha-automation-action, ha-automation-condition")
@@ -110,6 +120,8 @@ export class HaManualAutomationEditor extends LitElement {
 
   private _previousConfig?: ManualAutomationConfig;
 
+  private _prevSidebarWidthPx?: number;
+
   public connectedCallback() {
     super.connectedCallback();
     window.addEventListener("paste", this._handlePaste);
@@ -303,9 +315,11 @@ export class HaManualAutomationEditor extends LitElement {
             .hass=${this.hass}
             .narrow=${this.narrow}
             .config=${this._sidebarConfig}
-            @value-changed=${this._sidebarConfigChanged}
             .disabled=${this.disabled}
             .sidebarKey=${this._sidebarKey}
+            @value-changed=${this._sidebarConfigChanged}
+            @sidebar-resized=${this._resizeSidebar}
+            @sidebar-resizing-stopped=${this._stopResizeSidebar}
           ></ha-automation-sidebar>
         </div>
       </div>
@@ -314,6 +328,12 @@ export class HaManualAutomationEditor extends LitElement {
 
   protected firstUpdated(changedProps: PropertyValues): void {
     super.firstUpdated(changedProps);
+
+    this.style.setProperty(
+      "--sidebar-dynamic-width",
+      `${this._sidebarWidthPx}px`
+    );
+
     const expanded = extractSearchParam("expanded");
     if (expanded === "1") {
       this._clearParam("expanded");
@@ -642,6 +662,31 @@ export class HaManualAutomationEditor extends LitElement {
     }
   }
 
+  private _resizeSidebar(ev) {
+    ev.stopPropagation();
+    const delta = ev.detail.deltaInPx as number;
+
+    // set initial resize width to add / reduce delta from it
+    if (!this._prevSidebarWidthPx) {
+      this._prevSidebarWidthPx =
+        this._sidebarElement?.clientWidth || SIDEBAR_DEFAULT_WIDTH;
+    }
+
+    const widthPx = delta + this._prevSidebarWidthPx;
+
+    this._sidebarWidthPx = widthPx;
+
+    this.style.setProperty(
+      "--sidebar-dynamic-width",
+      `${this._sidebarWidthPx}px`
+    );
+  }
+
+  private _stopResizeSidebar(ev) {
+    ev.stopPropagation();
+    this._prevSidebarWidthPx = undefined;
+  }
+
   static get styles(): CSSResultGroup {
     return [
       saveFabStyles,
diff --git a/src/panels/config/automation/styles.ts b/src/panels/config/automation/styles.ts
index b27050de79..56623282e4 100644
--- a/src/panels/config/automation/styles.ts
+++ b/src/panels/config/automation/styles.ts
@@ -1,5 +1,8 @@
 import { css } from "lit";
 
+export const SIDEBAR_MIN_WIDTH = 375;
+export const CONTENT_MIN_WIDTH = 350;
+
 export const rowStyles = css`
   ha-icon-button {
     --mdc-theme-text-primary-on-background: var(--primary-text-color);
@@ -109,7 +112,12 @@ export const manualEditorStyles = css`
   }
 
   .has-sidebar {
-    --sidebar-width: min(35vw, 500px);
+    --sidebar-width: min(
+      max(var(--sidebar-dynamic-width), ${SIDEBAR_MIN_WIDTH}px),
+      100vw - ${CONTENT_MIN_WIDTH}px - var(--mdc-drawer-width, 0px),
+      var(--ha-automation-editor-max-width) -
+        ${CONTENT_MIN_WIDTH}px - var(--mdc-drawer-width, 0px)
+    );
     --sidebar-gap: 16px;
   }
 
diff --git a/src/panels/config/script/ha-script-editor.ts b/src/panels/config/script/ha-script-editor.ts
index dda79b8e59..a742ff1afc 100644
--- a/src/panels/config/script/ha-script-editor.ts
+++ b/src/panels/config/script/ha-script-editor.ts
@@ -1062,6 +1062,12 @@ export class HaScriptEditor extends SubscribeMixin(
     return [
       haStyle,
       css`
+        :host {
+          --ha-automation-editor-max-width: var(
+            --ha-automation-editor-width,
+            1540px
+          );
+        }
         .yaml-mode {
           height: 100%;
           display: flex;
@@ -1114,7 +1120,7 @@ export class HaScriptEditor extends SubscribeMixin(
         }
 
         manual-script-editor {
-          max-width: 1540px;
+          max-width: var(--ha-automation-editor-max-width);
           padding: 0 12px;
         }
 
diff --git a/src/panels/config/script/manual-script-editor.ts b/src/panels/config/script/manual-script-editor.ts
index a6c805816e..086e48fd79 100644
--- a/src/panels/config/script/manual-script-editor.ts
+++ b/src/panels/config/script/manual-script-editor.ts
@@ -21,6 +21,7 @@ import {
   string,
 } from "superstruct";
 import { ensureArray } from "../../../common/array/ensure-array";
+import { storage } from "../../../common/decorators/storage";
 import { canOverrideAlphanumericInput } from "../../../common/dom/can-override-input";
 import { fireEvent } from "../../../common/dom/fire_event";
 import { constructUrlCurrentPath } from "../../../common/url/construct-url";
@@ -47,6 +48,7 @@ import "../automation/action/ha-automation-action";
 import type HaAutomationAction from "../automation/action/ha-automation-action";
 import "../automation/ha-automation-sidebar";
 import type HaAutomationSidebar from "../automation/ha-automation-sidebar";
+import { SIDEBAR_DEFAULT_WIDTH } from "../automation/manual-automation-editor";
 import { showPasteReplaceDialog } from "../automation/paste-replace-dialog/show-dialog-paste-replace";
 import { manualEditorStyles, saveFabStyles } from "../automation/styles";
 import "./ha-script-fields";
@@ -84,6 +86,13 @@ export class HaManualScriptEditor extends LitElement {
 
   @state() private _sidebarKey?: string;
 
+  @storage({
+    key: "automation-sidebar-width",
+    state: false,
+    subscribe: false,
+  })
+  private _sidebarWidthPx = SIDEBAR_DEFAULT_WIDTH;
+
   @query("ha-script-fields")
   private _scriptFields?: HaScriptFields;
 
@@ -98,6 +107,8 @@ export class HaManualScriptEditor extends LitElement {
 
   private _openFields = false;
 
+  private _prevSidebarWidthPx?: number;
+
   public addFields() {
     this._openFields = true;
     fireEvent(this, "value-changed", {
@@ -252,8 +263,10 @@ export class HaManualScriptEditor extends LitElement {
             .isWide=${this.isWide}
             .hass=${this.hass}
             .config=${this._sidebarConfig}
-            @value-changed=${this._sidebarConfigChanged}
             .disabled=${this.disabled}
+            @value-changed=${this._sidebarConfigChanged}
+            @sidebar-resized=${this._resizeSidebar}
+            @sidebar-resizing-stopped=${this._stopResizeSidebar}
           ></ha-automation-sidebar>
         </div>
       </div>
@@ -262,6 +275,12 @@ export class HaManualScriptEditor extends LitElement {
 
   protected firstUpdated(changedProps: PropertyValues): void {
     super.firstUpdated(changedProps);
+
+    this.style.setProperty(
+      "--sidebar-dynamic-width",
+      `${this._sidebarWidthPx}px`
+    );
+
     const expanded = extractSearchParam("expanded");
     if (expanded === "1") {
       this._clearParam("expanded");
@@ -557,6 +576,31 @@ export class HaManualScriptEditor extends LitElement {
     }
   }
 
+  private _resizeSidebar(ev) {
+    ev.stopPropagation();
+    const delta = ev.detail.deltaInPx as number;
+
+    // set initial resize width to add / reduce delta from it
+    if (!this._prevSidebarWidthPx) {
+      this._prevSidebarWidthPx =
+        this._sidebarElement?.clientWidth || SIDEBAR_DEFAULT_WIDTH;
+    }
+
+    const widthPx = delta + this._prevSidebarWidthPx;
+
+    this._sidebarWidthPx = widthPx;
+
+    this.style.setProperty(
+      "--sidebar-dynamic-width",
+      `${this._sidebarWidthPx}px`
+    );
+  }
+
+  private _stopResizeSidebar(ev) {
+    ev.stopPropagation();
+    this._prevSidebarWidthPx = undefined;
+  }
+
   static get styles(): CSSResultGroup {
     return [
       saveFabStyles,