Can't change res on mac ue4

Hey so I converted my windows project to my mac and now whenever I want to change the res I normally do the CC r.setres 1920x1080 but whenever I change the res to anything apart from 1920x1080 on my mac, my whole ue4 just crashes yet it works perfectly fine on my windows pc…
Please can someone help me out, any help is much appreciated, thank you! :slight_smile:

Edit I found out that whenever I try to use windowed full screen mode on mac it doesnt work, and full screen also doesn’t work, the only one I can use is windowed. Does anyone know what I can do to make windowed full screen work??