How to Hide the "Boostfab Panel" Admin Menu

function plt_hide_3d_printing_pro_by_boostfab_menus() {
	//Hide the "Boostfab Panel" menu.
	remove_menu_page('boostfab-panel');
}

add_action('admin_menu', 'plt_hide_3d_printing_pro_by_boostfab_menus', 11);

Where do I put this code?