How to Hide DSGVO All in one for WP Admin Menus

function plt_hide_dsgvo_all_in_one_for_wp_menus() {
	//Hide "DSGVO AIO".
	remove_menu_page('dsgvoaio-free-settings-page');
	//Hide "DSGVO AIO → DSGVO AIO".
	remove_submenu_page('dsgvoaio-free-settings-page', 'dsgvoaio-free-settings-page');
	//Hide "DSGVO AIO → Opt-in/Opt-out Log".
	remove_submenu_page('dsgvoaio-free-settings-page', 'dsgvoaiofree-show-log');
	//Hide "DSGVO AIO → Import / Export".
	remove_submenu_page('dsgvoaio-free-settings-page', 'dsgvoaio-free-import-export');
	//Hide "DSGVO AIO → Changelog".
	remove_submenu_page('dsgvoaio-free-settings-page', 'dsgvoaiofree-changelog');
}

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

Where do I put this code?