For the moment it can be worked around by launching the game with the -Windowed command-line argument. Edit: Once you get in-game it should be fine to set window mode to Borderless (but not Fullscreen).
Unfortunately the crash is related to my over-exuberant upgrade to Unreal 4.23. Usually I would wait until the .1 patch comes out, but in this case I was hoping to get a physics bug taken care of. I’ll merge us with the .1 patch as soon as it comes out to get this fixed up.
Thank you to LuisVip, Great Hero J and MoltonMontro for the crash reports!
Add the -Windowed command to it from there. You’ll be able to enter the game, and while you’re in the game you could optionally switch off Fullscreen to either Windowed or Borderless too.