How to Hide Support Genix Lite Admin Menus

function plt_hide_support_genix_lite_menus() {
	//Hide "Support Genix".
	remove_menu_page('support-genix');
	//Hide "Support Genix → Tickets".
	remove_submenu_page('support-genix', 'support-genix#/tickets');
	//Hide "Support Genix → Settings".
	remove_submenu_page('support-genix', 'support-genix#/settings');
	//Hide "Support Genix → Upgrade to Pro".
	remove_submenu_page('support-genix', 'https://supportgenix.com/pricing/?utm_source=admin&utm_medium=mainmenu&utm_campaign=free');
}

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

Where do I put this code?