How to Hide Wallkit Admin Menus

function plt_hide_wallkit_menus() {
	//Hide "Wallkit".
	remove_menu_page('wallkit/admin/class-wallkit-wp-admin.php');
	//Hide "Wallkit → Wallkit".
	remove_submenu_page('wallkit/admin/class-wallkit-wp-admin.php', 'wallkit/admin/class-wallkit-wp-admin.php');
	//Hide "Wallkit → Settings".
	remove_submenu_page('wallkit/admin/class-wallkit-wp-admin.php', 'wallkit-settings');
	//Hide "Wallkit → Appearance".
	remove_submenu_page('wallkit/admin/class-wallkit-wp-admin.php', 'wallkit-Appearance');
	//Hide "Wallkit → Advanced".
	remove_submenu_page('wallkit/admin/class-wallkit-wp-admin.php', 'wallkit-advanced');
}

add_action('admin_menu', 'plt_hide_wallkit_menus', 11);
Where do I put this code?