Tips on Customizing Filter Everything — Product Filter & WordPress Filter

How to Hide Filter Everything — WooCommerce Product & WordPress Filter Admin Menus

function plt_hide_filter_everything_menus() {
	//Hide "Filters".
	remove_menu_page('edit.php?post_type=filter-set');
	//Hide "Filters → Filter Sets".
	remove_submenu_page('edit.php?post_type=filter-set', 'edit.php?post_type=filter-set');
	//Hide "Filters → Add New".
	remove_submenu_page('edit.php?post_type=filter-set', 'post-new.php?post_type=filter-set');
	//Hide "Filters → Settings".
	remove_submenu_page('edit.php?post_type=filter-set', 'filters-settings');
}

add_action('admin_menu', 'plt_hide_filter_everything_menus', 11);

Where do I put this code?

How to Hide Filter Everything — WooCommerce Product & WordPress Filter Meta Boxes

function plt_hide_filter_everything_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Filters" meta box.
	remove_meta_box('filters-set-items', $screen->id, 'normal');
	//Hide the "Settings" meta box.
	remove_meta_box('filters-set-settings', $screen->id, 'normal');
	//Hide the "Publish" meta box.
	remove_meta_box('submitdiv', $screen->id, 'side');
	//Hide the "How to?" meta box.
	remove_meta_box('filter-set-advice', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_filter_everything_metaboxes', 20);