How to Hide Final Tiles Grid Gallery - Image Gallery Admin Menus

function plt_hide_final_tiles_grid_gallery_lite_menus() {
	//Hide "Final Tiles Gallery".
	remove_menu_page('ftg-lite-gallery-admin');
	//Hide "Final Tiles Gallery → Final Tiles Gallery".
	remove_submenu_page('ftg-lite-gallery-admin', 'ftg-lite-gallery-admin');
	//Hide "Final Tiles Gallery → Add Gallery".
	remove_submenu_page('ftg-lite-gallery-admin', 'ftg-add-gallery');
	//Hide "Final Tiles Gallery → Affiliation".
	remove_submenu_page('ftg-lite-gallery-admin', 'ftg-lite-gallery-admin-affiliation');
	//Hide "Final Tiles Gallery → Contact Us".
	remove_submenu_page('ftg-lite-gallery-admin', 'ftg-lite-gallery-admin-contact');
	//Hide "Final Tiles Gallery → Support Forum".
	remove_submenu_page('ftg-lite-gallery-admin', 'ftg-lite-gallery-admin-wp-support-forum');
	//Hide "Final Tiles Gallery → Upgrade".
	remove_submenu_page('ftg-lite-gallery-admin', 'ftg-lite-gallery-admin-pricing');
}

add_action('admin_menu', 'plt_hide_final_tiles_grid_gallery_lite_menus', 1000000000);
Where do I put this code?