diff --git src/bp-core/bp-core-template-loader.php src/bp-core/bp-core-template-loader.php
index eed2d9df5..b270d49f8 100644
--- src/bp-core/bp-core-template-loader.php
+++ src/bp-core/bp-core-template-loader.php
@@ -453,11 +453,22 @@ function bp_get_query_template( $type, $templates = array() ) {
 	 */
 	$templates = apply_filters( "bp_get_{$type}_template", $templates );
 
-	// Filter possible templates, try to match one, and set any BuddyPress theme
-	// compat properties so they can be cross-checked later.
+	/*
+	 * Filter possible templates, try to match one, and set any BuddyPress theme
+	 * compat properties so they can be cross-checked later.
+	 */
 	$templates = bp_set_theme_compat_templates( $templates );
 	$template  = bp_locate_template( $templates );
-	$template  = bp_set_theme_compat_template( $template );
+
+	/*
+	 * The current theme is using the WordPress Full Site Editing feature.
+	 * BuddyPress then needs to use the WordPress template canvas to retrieve the community content.
+	 */
+	if ( current_theme_supports( 'block-templates' ) && $template === get_theme_file_path( 'index.php' ) ) {
+		$template = ABSPATH . WPINC . '/template-canvas.php';
+	}
+
+	$template = bp_set_theme_compat_template( $template );
 
 	/**
 	 * Filters the path to a template file.
diff --git src/bp-templates/bp-nouveau/buddypress-functions.php src/bp-templates/bp-nouveau/buddypress-functions.php
index bffb1ce40..98e086513 100644
--- src/bp-templates/bp-nouveau/buddypress-functions.php
+++ src/bp-templates/bp-nouveau/buddypress-functions.php
@@ -176,12 +176,33 @@ class BP_Nouveau extends BP_Theme_Compat {
 		// We need to neutralize the BuddyPress core "bp_core_render_message()" once it has been added.
 		add_action( 'bp_actions', array( $this, 'neutralize_core_template_notices' ), 6 );
 
-		// Scripts.
-		add_action( 'bp_enqueue_scripts', array( $this, 'register_scripts' ), 2 ); // Register theme JS.
+		// Scripts & Styles.
+		$registration_params = array(
+			'hook'     => 'bp_enqueue_scripts',
+			'priority' => 2,
+		);
+
+		/*
+		 * The WordPress Full Site Editing feature needs Scripts
+		 * and Styles to be registered earlier.
+		 */
+		if ( current_theme_supports( 'block-templates' ) ) {
+			$registration_params['hook']     = 'bp_init';
+			$registration_params['priority'] = 20;
+		}
+
+		// Register theme JS.
+		add_action( $registration_params['hook'], array( $this, 'register_scripts' ), $registration_params['priority'] );
+
+		// Enqueue theme CSS.
+		add_action( 'bp_enqueue_scripts', array( $this, 'enqueue_styles' ) );
+
+		// Enqueue theme JS.
+		add_action( 'bp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
+
+		// Enqueue theme script localization.
+		add_filter( 'bp_enqueue_scripts', array( $this, 'localize_scripts' ) );
 		remove_action( 'bp_enqueue_scripts', 'bp_core_confirmation_js' );
-		add_action( 'bp_enqueue_scripts', array( $this, 'enqueue_styles' ) ); // Enqueue theme CSS.
-		add_action( 'bp_enqueue_scripts', array( $this, 'enqueue_scripts' ) ); // Enqueue theme JS.
-		add_filter( 'bp_enqueue_scripts', array( $this, 'localize_scripts' ) ); // Enqueue theme script localization.
 
 		// Body no-js class.
 		add_filter( 'body_class', array( $this, 'add_nojs_body_class' ), 20, 1 );
diff --git src/bp-templates/bp-nouveau/includes/customizer.php src/bp-templates/bp-nouveau/includes/customizer.php
index 7a5bcd9d0..4b675ab9f 100644
--- src/bp-templates/bp-nouveau/includes/customizer.php
+++ src/bp-templates/bp-nouveau/includes/customizer.php
@@ -3,7 +3,7 @@
  * Code to hook into the WP Customizer
  *
  * @since 3.0.0
- * @version 3.1.0
+ * @version 10.0.0
  */
 
 /**
@@ -21,6 +21,7 @@ function bp_nouveau_customize_register( WP_Customize_Manager $wp_customize ) {
 	require_once( trailingslashit( bp_nouveau()->includes_dir ) . 'customizer-controls.php' );
 	$wp_customize->register_control_type( 'BP_Nouveau_Nav_Customize_Control' );
 	$bp_nouveau_options = bp_nouveau_get_appearance_settings();
+	$layout_widths      = bp_nouveau_get_theme_layout_widths();
 
 	$wp_customize->add_panel( 'bp_nouveau_panel', array(
 		'description' => __( 'Customize the appearance of BuddyPress Nouveau Template pack.', 'buddypress' ),
@@ -202,7 +203,7 @@ function bp_nouveau_customize_register( WP_Customize_Manager $wp_customize ) {
 		),
 	) );
 
-	if ( current_theme_supports( 'align-wide' ) ) {
+	if ( $layout_widths ) {
 		$settings['bp_nouveau_appearance[global_alignment]'] = array(
 			'index'             => 'global_alignment',
 			'capability'        => 'bp_moderate',
@@ -306,17 +307,13 @@ function bp_nouveau_customize_register( WP_Customize_Manager $wp_customize ) {
 	 */
 	$controls = apply_filters( 'bp_nouveau_customizer_controls', $controls );
 
-	if ( current_theme_supports( 'align-wide' ) ) {
+	if ( $layout_widths ) {
 		$controls['global_alignment'] = array(
 			'label'      => __( 'Select the BuddyPress container width for your site.', 'buddypress' ),
 			'section'    => 'bp_nouveau_general_settings',
 			'settings'   => 'bp_nouveau_appearance[global_alignment]',
 			'type'       => 'select',
-			'choices'    => array(
-				'alignnone' => __( 'Default width', 'buddypress' ),
-				'alignwide' => __( 'Wide width', 'buddypress' ),
-				'alignfull' => __( 'Full width', 'buddypress' ),
-			),
+			'choices'    => $layout_widths,
 		);
 	}
 
diff --git src/bp-templates/bp-nouveau/includes/functions.php src/bp-templates/bp-nouveau/includes/functions.php
index a761586ae..479163ccd 100644
--- src/bp-templates/bp-nouveau/includes/functions.php
+++ src/bp-templates/bp-nouveau/includes/functions.php
@@ -3,7 +3,7 @@
  * Common functions
  *
  * @since 3.0.0
- * @version 9.0.0
+ * @version 10.0.0
  */
 
 // Exit if accessed directly.
@@ -1639,3 +1639,42 @@ function bp_nouveau_render_primary_nav_block( $attributes = array() ) {
 
 	return $widget_content;
 }
+
+/**
+ * Retuns the theme layout available widths.
+ *
+ * @since 10.0.0
+ *
+ * @return array The available theme layout widths.
+ */
+function bp_nouveau_get_theme_layout_widths() {
+	$layout_widths = array();
+
+	if ( current_theme_supports( 'align-wide' ) ) {
+		$layout_widths = array(
+			'alignnone' => __( 'Default width', 'buddypress' ),
+			'alignwide' => __( 'Wide width', 'buddypress' ),
+			'alignfull' => __( 'Full width', 'buddypress' ),
+		);
+	}
+
+	if ( bp_is_running_wp( '5.9-alpha-20211112.120915' ) ) {
+		$theme_layouts = wp_get_global_settings( array( 'layout' ) );
+
+		if ( isset( $theme_layouts['wideSize'] ) && $theme_layouts['wideSize'] ) {
+			$layout_widths = array(
+				'alignnone' => __( 'Content width', 'buddypress' ),
+				'alignwide' => __( 'Wide width', 'buddypress' ),
+			);
+		}
+	}
+
+	/**
+	 * Filter here to edit the available theme layout widths.
+	 *
+	 * @since 10.0.0
+	 *
+	 * @param array $layout_widths The available theme layout widths.
+	 */
+	return apply_filters( 'bp_nouveau_get_theme_layout_widths', $layout_widths );
+}
diff --git src/bp-templates/bp-nouveau/includes/template-tags.php src/bp-templates/bp-nouveau/includes/template-tags.php
index ef5ad0075..7b804a082 100644
--- src/bp-templates/bp-nouveau/includes/template-tags.php
+++ src/bp-templates/bp-nouveau/includes/template-tags.php
@@ -3,7 +3,7 @@
  * Common template tags
  *
  * @since 3.0.0
- * @version 8.0.0
+ * @version 10.0.0
  */
 
 // Exit if accessed directly.
@@ -1529,8 +1529,10 @@ function bp_nouveau_container_classes() {
 			}
 		}
 
-		$global_alignment = bp_nouveau_get_temporary_setting( 'global_alignment', bp_nouveau_get_appearance_settings( 'global_alignment' ) );
-		if ( $global_alignment && 'alignnone' !== $global_alignment && current_theme_supports( 'align-wide' ) ) {
+		$global_alignment  = bp_nouveau_get_temporary_setting( 'global_alignment', bp_nouveau_get_appearance_settings( 'global_alignment' ) );
+		$layout_widths     = bp_nouveau_get_theme_layout_widths();
+
+		if ( $global_alignment && 'alignnone' !== $global_alignment && $layout_widths ) {
 			$classes[] = $global_alignment;
 		}