How to Hide Sell BTC By HayyatApps Lite Admin Menus

function plt_hide_sell_btc_by_hayyatapps_menus() {
	//Hide "Sell BTC Lite".
	remove_menu_page('MAINMENUHAYYAT');
	//Hide "Sell BTC Lite → Sell BTC Lite".
	remove_submenu_page('MAINMENUHAYYAT', 'MAINMENUHAYYAT');
	//Hide "Sell BTC Lite → Settings".
	remove_submenu_page('MAINMENUHAYYAT', 'HAYYAT_settings');
	//Hide "Sell BTC Lite → Orders".
	remove_submenu_page('MAINMENUHAYYAT', 'HAYYAT_orders');
	//Hide "Sell BTC Lite → Developers".
	remove_submenu_page('MAINMENUHAYYAT', 'HAYYAT_developers');
	//Hide "Sell BTC Lite → Go Pro".
	remove_submenu_page('MAINMENUHAYYAT', 'ProHAPPS');
}

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

Where do I put this code?