Add code to functions.php of theme using:
add_filter('use_block_editor_for_post', '__return_false', 10);
add_filter( 'use_widgets_block_editor', '__return_false' );
or
function lap_disable_gutenberg($current_status, $post_type)
{
// Disabled post types
$disabled_post_types = array( 'post' );
// Change $can_edit to false for any post types in the disabled post types array
if (in_array($post_type, $disabled_post_types, true)) {
$current_status = false;
}
return $current_status;
}
add_filter('use_block_editor_for_post_type', 'lap_disable_gutenberg', 10, 2);
