How to Hide GutenKit Blocks Admin Menus

function plt_hide_gutenkit_blocks_addon_menus() {
	//Hide "Gutenkit".
	remove_menu_page('gutenkit');
	//Hide "Gutenkit → Gutenkit".
	remove_submenu_page('gutenkit', 'gutenkit');
	//Hide "Gutenkit → Welcome".
	remove_submenu_page('gutenkit', 'http://127.0.0.1/wp-admin/admin.php?page=gutenkit#welcome');
	//Hide "Gutenkit → Blocks".
	remove_submenu_page('gutenkit', 'http://127.0.0.1/wp-admin/admin.php?page=gutenkit#blocks');
	//Hide "Gutenkit → Modules".
	remove_submenu_page('gutenkit', 'http://127.0.0.1/wp-admin/admin.php?page=gutenkit#modules');
	//Hide "Gutenkit → Popups".
	remove_submenu_page('gutenkit', 'popup-builder-block');
	//Hide "Gutenkit → Settings".
	remove_submenu_page('gutenkit', 'http://127.0.0.1/wp-admin/admin.php?page=gutenkit#settings');
	//Hide "Gutenkit → Our Plugins".
	remove_submenu_page('gutenkit', 'gutenkit-blocks-addon_wpmet_plugins');
}

add_action('admin_menu', 'plt_hide_gutenkit_blocks_addon_menus', 100000);

Where do I put this code?