This worked for me. Thanks.

I have downloaded Xcode 12.2 but now I don’t see anymore the model/view/controller way of developping/displaying app as I learned it in a course. Instead Xcode shows the following follets: Shared, iOS, macOS, and other tests folders. Where can I find some courses on how to develop an app with Xcode. Thanks a lot for any hints that could help me continue.

I have to not been developing much lately... so everything on my Mac was outdated. I decided to develop an app a few days and this is when my MAC installed MacOS Big Sur. After the update was completed, XCode didn't start because of several issues one of which is described here: https://stackoverflow.com/questions/58689699/xcode-not-opening-after-updating-to-macos-catalina Anyway I followed other developer recommendations and finally managed to launch XCode. so I started to create a new project but then I had this freeze issue whenever I clicked on either LaunchScreen.storyboard or Main.storyboard. I have plenty of disk space and RAM. I will try XCode 11.3. Thanks for the tip.