add_filter( 'show_admin_bar', '__return_false' );
Disable Gutenberg editor
Disable the Block Editor to return to the Classic Editor.
add_filter('gutenberg_can_edit_post', '__return_false', 5);
add_filter('use_block_editor_for_post', '__return_false', 5);Remove WordPress version number
add_filter('the_generator', '__return_empty_string');Disable auto-updates for themes
add_filter( 'auto_update_theme', '__return_false' );Disable auto-updates for plugins
add_filter( 'auto_update_plugin', '__return_false' );Disable core auto-updates
add_filter( 'auto_update_core', '__return_false' );