Worked on 4k until this morning I only have the 1080p option now
Anyone shed any light on why this happened now?
Resolution options are determined by the GPU. What do you have?
Also I believe you can still override resolution by editing prefs.xml
Iris(r)Xe is that what you mean
It’s been on 4K until today
I don’t think that’s supposed to get a 4K option, but Zwift have flip flopped on how that setting works, at times offering only 1080p, then allowing all the options, then going back to 1080p only for a GPU that gets the Basic graphics profile. I think you might be able to override it by manually editing prefs.xml and that’s probably your only option unless this is a desktop machine that you could install a better GPU in.
Beyond my capabilities changing settings as you mention but thanks for your help
If you want to try it, make a backup copy of Documents\Zwift\prefs.xml, then edit that file in the Notepad app, look for the line with USER_RESOLUTION_PREF and make it look like this:
<USER_RESOLUTION_PREF>3840x2160</USER_RESOLUTION_PREF>
Or find a nerdy teenager and bribe them to do it 
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Thank Paul nerdy teenager needed