How to Hide Spectra Legacy Admin Menus

function plt_hide_ultimate_addons_for_gutenberg_menus() {
	//Hide "Spectra Legacy Onboarding".
	remove_menu_page('spectra-onboarding');

	//Hide "Spectra Legacy".
	remove_menu_page('spectra');
	//Hide "Spectra Legacy → Dashboard".
	remove_submenu_page('spectra', 'spectra');
	//Hide "Spectra Legacy → Blocks".
	remove_submenu_page('spectra', 'spectra&path=blocks');
	//Hide "Spectra Legacy → Popup Builder".
	remove_submenu_page('spectra', 'edit.php?post_type=spectra-popup');
	//Hide "Spectra Legacy → AI Features".
	remove_submenu_page('spectra', 'spectra&path=ai-features');
	//Hide "Spectra Legacy → Settings".
	remove_submenu_page('spectra', 'spectra&path=settings');
	//Hide "Spectra Legacy → Learn".
	remove_submenu_page('spectra', 'spectra&path=learn');
	//Hide "Spectra Legacy → Get Spectra Pro".
	remove_submenu_page('spectra', 'spectra&path=free-vs-pro');
}

add_action('admin_menu', 'plt_hide_ultimate_addons_for_gutenberg_menus', 11);
Where do I put this code?