diff --git a/lib/compat/wordpress-6.4/theme-previews.php b/lib/compat/wordpress-6.4/theme-previews.php
new file mode 100644
index 0000000000000..5755fc992921d
--- /dev/null
+++ b/lib/compat/wordpress-6.4/theme-previews.php
@@ -0,0 +1,27 @@
+<?php
+/**
+ * Enable theme previews in the Site Editor for block themes.
+ *
+ * @package gutenberg
+ */
+
+/**
+ * Allow developers to customize the back to dashboard link in the Site Editor
+ *
+ * @param array $settings The editor settings.
+ * @return array The editor settings.
+ */
+function gutenberg_theme_preview_block_editor_settings_all( $settings ) {
+	$settings['__experimentalDashboardLink']     = 'themes.php';
+	$settings['__experimentalDashboardLinkText'] = __( 'Go back to the theme showcase' );
+	return $settings;
+}
+
+/**
+ * Attaches filters to enable theme previews in the Site Editor.
+ * This would go inside of `initialize_theme_preview_hooks`
+ * to avoid the global scope when we port this to the core.
+ */
+if ( ! empty( $_GET['wp_theme_preview'] ) ) {
+	add_filter( 'block_editor_settings_all', 'gutenberg_theme_preview_block_editor_settings_all' );
+}
diff --git a/lib/load.php b/lib/load.php
index 51a6500396650..74731f36b6623 100644
--- a/lib/load.php
+++ b/lib/load.php
@@ -53,6 +53,7 @@ function gutenberg_is_experiment_enabled( $name ) {
 	// WordPress 6.4 compat.
 	require_once __DIR__ . '/compat/wordpress-6.4/class-gutenberg-rest-global-styles-revisions-controller-6-4.php';
 	require_once __DIR__ . '/compat/wordpress-6.4/rest-api.php';
+	require_once __DIR__ . '/compat/wordpress-6.4/theme-previews.php';
 
 	// Plugin specific code.
 	require_once __DIR__ . '/class-wp-rest-global-styles-controller-gutenberg.php';
diff --git a/packages/edit-site/src/components/sidebar-navigation-screen/index.js b/packages/edit-site/src/components/sidebar-navigation-screen/index.js
index f8824332f5152..9ab6f58c81b21 100644
--- a/packages/edit-site/src/components/sidebar-navigation-screen/index.js
+++ b/packages/edit-site/src/components/sidebar-navigation-screen/index.js
@@ -41,10 +41,11 @@ export default function SidebarNavigationScreen( {
 	description,
 	backPath: backPathProp,
 } ) {
-	const { dashboardLink } = useSelect( ( select ) => {
+	const { dashboardLink, dashboardLinkText } = useSelect( ( select ) => {
 		const { getSettings } = unlock( select( editSiteStore ) );
 		return {
 			dashboardLink: getSettings().__experimentalDashboardLink,
+			dashboardLinkText: getSettings().__experimentalDashboardLinkText,
 		};
 	}, [] );
 	const { getTheme } = useSelect( coreStore );
@@ -92,15 +93,9 @@ export default function SidebarNavigationScreen( {
 						<SidebarButton
 							icon={ icon }
 							label={
-								! isPreviewingTheme()
-									? __( 'Go to the Dashboard' )
-									: __( 'Go back to the theme showcase' )
-							}
-							href={
-								! isPreviewingTheme()
-									? dashboardLink || 'index.php'
-									: 'themes.php'
+								dashboardLinkText || __( 'Go to the Dashboard' )
 							}
+							href={ dashboardLink || 'index.php' }
 						/>
 					) }
 					<Heading