CODE EXAMPLE FOR PHP

wordpress deactivate widgets gutenberg

// Add to your functions.php theme file:

// Disables the block editor from managing widgets in the Gutenberg plugin.
add_filter( 'gutenberg_use_widgets_block_editor', '__return_false', 100 );
// Disables the block editor from managing widgets.
add_filter( 'use_widgets_block_editor', '__return_false' );