Firefox or Chrome only!! When trying to use Edge across several different windows platforms it is very inconsistent. In several of the Surface Pro tablets it will not display the POS screen at all. Just plain white background. On some desktop PC’s it will not allow you to select some printing functions.
Edge is not stable yet with ERPNext.
Also, it appears that @Witton is trying to use this on iOS and not a Windows platform. So his/her mileage may be different.