How to Hide LianaAutomation Site Tracking Admin Menus

function plt_hide_lianaautomation_sitetracking_menus() {
	//Hide the "LianaAutomation" menu.
	remove_menu_page('lianaautomation');
	//Hide the "LianaAutomation → Site Tracking" menu.
	remove_submenu_page('lianaautomation', 'lianaautomation-sitetracking');
}

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

Where do I put this code?