When we release upgrades template files will change and you will have to reapply all your changes again (that's if you can remember where they all are). If you keep your changes in a separate Custom CSS file you'll have no issues upgrading.
Thanks for the reply. Unfortunately, while the arrow does vanish after the appropriate CSS is added the space between the affected menu item and the next remains unchanged..
Is there a way to remove the arrows while at the same removing the (now) extra space once held by the arrow at the same time?