docs: Highlight admin ui compatibilityMode in the documentation (#3785)

docs/docs/guides/extending-the-admin-ui/getting-started/index.md

@@ -11,6 +11,7 @@ The Angular-based Admin UI has been replaced by the new [React Admin Dashboard](
 The first stable release of the React Admin Dashboard is targeted for **the end of July 2025**.
 
 **For new projects, we strongly recommend using the [React Admin Dashboard](/guides/extending-the-dashboard/getting-started/) instead.**
+If you want to use the Admin UI and the Dashboard together please change the compatibilityMode to true (/reference/core-plugins/admin-ui-plugin/admin-ui-plugin-options#compatibilitymode)
 :::
 
 When creating a plugin, you may wish to extend the Admin UI in order to expose a graphical interface to the plugin's functionality, or to add new functionality to the Admin UI itself. The UI can be extended with custom components written in [Angular](https://angular.io/) or [React](https://react.dev/).

docs/docs/guides/extending-the-dashboard/deployment/index.md

@@ -51,6 +51,11 @@ export default defineConfig({
 
 ### 2. Add DashboardPlugin to Vendure Config
 
+:::warning Angular Admin UI compatibilityMode
+If you want to use the Admin UI and the Dashboard together please change the compatibilityMode to true (/reference/core-plugins/admin-ui-plugin/admin-ui-plugin-options#compatibilitymode)
+:::
+
+
 Add the DashboardPlugin to your `vendure-config.ts`:
 
 ```typescript title="src/vendure-config.ts"