How to Hide Buttonizer - Smart Floating Action Button Admin Menus

function plt_hide_buttonizer_multifunctional_button_menus() {
	//Hide "Buttonizer".
	remove_menu_page('Buttonizer');
	//Hide "Buttonizer → Buttonizer".
	remove_submenu_page('Buttonizer', 'Buttonizer');
	//Hide "Buttonizer → Edit buttons".
	remove_submenu_page('Buttonizer', 'admin.php?page=Buttonizer#/editor');
	//Hide "Buttonizer → I need support".
	remove_submenu_page('Buttonizer', 'admin.php?page=Buttonizer#/support');
	//Hide "Buttonizer → Community".
	remove_submenu_page('Buttonizer', 'https://community.buttonizer.pro/?referral=buttonizer-plugin-menu');
	//Hide "Buttonizer → Knowledge base".
	remove_submenu_page('Buttonizer', 'https://community.buttonizer.pro/knowledgebase?referral=buttonizer-plugin-menu');
}

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

Where do I put this code?