iPad pro as extended display
What is the best way to use my iPad Pro 12.9 as an extended display for my iMac?
Well, I shelled out my $10 for Duet, and I wish I hadn't. I should have given more credence to the App Store reviews than I did the Duet help desk. They claimed it worked with Mojave, and just needed a few tweaks that they were working on. It needs more than tweaking. The only way to use the full iPad Pro screen is to use the lowest resolution available. Otherwise you have an ever increasing black bar at the bottom of the iPad screen. And despite what the Duet FAQ says, rotating your iPad does not allow it to go into portrait mode when using Duet. I have already deleted it.
