diff -r be944660c56a -r 3d72ae0968f4 wp/wp-admin/customize.php
--- a/wp/wp-admin/customize.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-admin/customize.php	Tue Sep 27 16:37:53 2022 +0200
@@ -188,16 +188,8 @@
 			<?php
 			$compatible_wp  = is_wp_version_compatible( $wp_customize->theme()->get( 'RequiresWP' ) );
 			$compatible_php = is_php_version_compatible( $wp_customize->theme()->get( 'RequiresPHP' ) );
-			$fse_safe       = true;
-
-			// Check if the theme requires the Gutenberg plugin to work correctly.
-			$theme_tags = $wp_customize->theme()->get( 'Tags' );
-
-			if ( ! empty( $theme_tags ) && in_array( 'full-site-editing', $theme_tags, true ) && ! function_exists( 'gutenberg_is_fse_theme' ) ) {
-				$fse_safe = false;
-			}
 			?>
-			<?php if ( $compatible_wp && $compatible_php && $fse_safe ) : ?>
+			<?php if ( $compatible_wp && $compatible_php ) : ?>
 				<?php $save_text = $wp_customize->is_theme_active() ? __( 'Publish' ) : __( 'Activate &amp; Publish' ); ?>
 				<div id="customize-save-button-wrapper" class="customize-save-button-wrapper" >
 					<?php submit_button( $save_text, 'primary save', 'save', false ); ?>
@@ -230,7 +222,7 @@
 				<ul></ul>
 			</div>
 			<div class="wp-full-overlay-sidebar-content" tabindex="-1">
-				<div id="customize-info" class="accordion-section customize-info">
+				<div id="customize-info" class="accordion-section customize-info" data-block-theme="<?php echo (int) wp_is_block_theme(); ?>">
 					<div class="accordion-section-title">
 						<span class="preview-notice">
 						<?php
@@ -241,9 +233,16 @@
 						<button type="button" class="customize-help-toggle dashicons dashicons-editor-help" aria-expanded="false"><span class="screen-reader-text"><?php _e( 'Help' ); ?></span></button>
 					</div>
 					<div class="customize-panel-description">
-					<?php
-						_e( 'The Customizer allows you to preview changes to your site before publishing them. You can navigate to different pages on your site within the preview. Edit shortcuts are shown for some editable elements.' );
-					?>
+						<p>
+							<?php
+							_e( 'The Customizer allows you to preview changes to your site before publishing them. You can navigate to different pages on your site within the preview. Edit shortcuts are shown for some editable elements. The Customizer is intended for use with non-block themes.' );
+							?>
+						</p>
+						<p>
+							<?php
+							_e( '<a href="https://wordpress.org/support/article/appearance-customize-screen/">Documentation on Customizer</a>' );
+							?>
+						</p>
 					</div>
 				</div>