Dont show tabs when less than 2 (#12439)

src/layouts/hass-tabs-subpage-data-table.ts

@@ -283,6 +283,9 @@ export class HaTabsSubpageDataTable extends LitElement {
         height: calc(100vh - 1px - var(--header-height));
         display: block;
       }
+      :host([narrow]) hass-tabs-subpage {
+        --main-title-margin: 0;
+      }
       .table-header {
         display: flex;
         align-items: center;

src/layouts/hass-tabs-subpage.ts

@@ -82,6 +82,16 @@ class HassTabsSubpage extends LitElement {
           (!page.advancedOnly || showAdvanced)
       );
 
+      if (shownTabs.length < 2) {
+        if (shownTabs.length === 1) {
+          const page = shownTabs[0];
+          return [
+            page.translationKey ? localizeFunc(page.translationKey) : page.name,
+          ];
+        }
+        return [""];
+      }
+
       return shownTabs.map(
         (page) =>
           html`
@@ -134,7 +144,7 @@ class HassTabsSubpage extends LitElement {
       this.narrow,
       this.localizeFunc || this.hass.localize
     );
-    const showTabs = tabs.length > 1 || !this.narrow;
+    const showTabs = tabs.length > 1;
     return html`
       <div class="toolbar">
         ${this.mainPage || (!this.backPath && history.state?.root)
@@ -159,8 +169,10 @@ class HassTabsSubpage extends LitElement {
                 @click=${this._backTapped}
               ></ha-icon-button-arrow-prev>
             `}
-        ${this.narrow
+        ${this.narrow || !showTabs
-          ? html`<div class="main-title"><slot name="header"></slot></div>`
+          ? html`<div class="main-title">
+              <slot name="header">${!showTabs ? tabs[0] : ""}</slot>
+            </div>`
           : ""}
         ${showTabs
           ? html`
@@ -283,6 +295,7 @@ class HassTabsSubpage extends LitElement {
         max-height: var(--header-height);
         line-height: 20px;
         color: var(--sidebar-text-color);
+        margin: var(--main-title-margin, 0 0 0 24px);
       }
 
       .content {