feat: hide editor preview ui

src/editor/editor/index.js

@@ -6,6 +6,11 @@ import apiFetch from '@wordpress/api-fetch';
 import { withDispatch, withSelect } from '@wordpress/data';
 import { useEffect, useState } from '@wordpress/element';
 
+/**
+ * Internal dependencies
+ */
+import './style.scss';
+
 export default compose( [
 	withDispatch( dispatch => {
 		const { lockPostSaving, unlockPostSaving } = dispatch( 'core/editor' );

src/editor/editor/style.scss

@@ -0,0 +1,4 @@
+// Hide the editor Preview UI
+.editor-post-preview__dropdown {
+	display: none;
+}