How to Hide the "Age Verification Settings" Admin Menu

function plt_hide_responsive_age_verification_menus() {
	//Hide the "Settings → Age Verification Settings" menu.
	remove_submenu_page('options-general.php', 'agev-age-verification');
}

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

Where do I put this code?