Is there any good information assembled to help UI designers create mocks for Powerapps? I haven't found any in my searches and it doesn't seem that using UWP as a foundation is really recommended or even possible.
Anything to get me started would be greatly appreciated.
The UI/UX of PowerApps is infinitely configurable (blessing and a curse). Some recommendations are to follow ABSOLUTELY EVERYTHING from Mehdi. He is a traditional app dev on the PowerApps Team that is just amazing.
Some other things I'd recommend is to tune into Paul Kroon's series on theme dev on YouTube. Its a bit heavy if you are new to PowerApps but he does an awesome job of walking you through, a to Z, creating your own PA theme.
Best of luck! and remember, this community IS THE BEST thing for your questions.
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