Customize entity: add step to revert entity ID to default (#39495)

source/_docs/configuration/customizing-devices.markdown

@@ -9,23 +9,35 @@ related:
   - docs: /docs/organizing/labels/
 ---
 
-## Customizing an entity
-
 After adding a new device, you might find the automatically assigned entity ID too technical and the entity lacking a friendly name. You can personalize these elements to better fit your naming conventions or modify other attributes like the icon.
 
 To change entity attributes, follow these steps:
 
 1. Go to {% my entities title="**Settings** > **Devices & services** > **Entities**" %} and select the entity from the list.
-2. In the top right corner, select the cog icon.
+2. In the top-right corner, select the {% icon "mdi:cog" %} cog icon.
 
    ![Entity dialog box with cog icon.](/images/docs/configuration/customizing-entity-dialog.png)
 
 3. Enter or edit the attributes:
-   - For example, the entity ID here could be shortened to `binary_sensor.living_room_motion_1`.
-     - Do not change the domain of the entity - the part before the `.` (binary_sensor, in this example).
+   - For example, the entity ID here could be shortened to `binary_sensor.lumi_sensor_aq2_opening`.
      - You can use lowercase letters, numbers, and underscores.
      - The ID must not start or end with an underscore.
+     - To undo the change and revert the ID to the default, select the {% icon "mdi:restore" %} icon.
+       - **Note**: You can only reset the ID to the default ID for entities with a unique ID.
+         - IDs of entities that are disabled or for which the integration is not set up cannot be reverted.
+     - To revert all the entity IDs for a device, on the device page, select the three dots {% icon "mdi:dots-vertical" %} menu, then select **Recreate entity IDs**.
+     - **Result**: This resets the entity ID and applies the current default naming convention.
+       - The terms used to generate the entity ID depends on a few factors. Prioritization is as follows:
+         1. If you changed the friendly name of the entity, the friendly name will be used.
+         2. The entity ID suggested by the integration (just a few integrations do this).
+         3. The default name in the user language, if using Latin script.
+            - If the something other than Latin script is used, the entity ID is based on the English default name.
+            - This is because entity IDs must use lowercase alphanumeric characters in the range of [a-z,1-9].
+
+        ![revert all entity IDs for a device from the device page](/images/docs/configuration/device-page-revert-entity-id.png)
+
    - Enter or edit the friendly name.
+     - In this example, this would change "Opening".
    - If needed, from the **Shown as** menu, you can select a different [device class](/integrations/homeassistant/#device-class).
    - If you like, add a [label](/docs/organizing/labels/).