Use classic widgets in WP 5.8 (#270)

inc/actions/namespace.php

@@ -95,6 +95,13 @@ function setup() {
 
 	// Add shortcode buttons.
 	add_action( 'init', __NAMESPACE__ . '\register_shortcode_buttons' );
+
+	remove_theme_support( 'widgets-block-editor' );
+
+	// Disables the block editor from managing widgets in the Gutenberg plugin.
+	add_filter( 'gutenberg_use_widgets_block_editor', '__return_false' );
+	// Disables the block editor from managing widgets.
+	add_filter( 'use_widgets_block_editor', '__return_false' );
 }
 
 /**