My mac is using Catalina, I was following the link installing macOS Beta on a separate APFS volume - https://support.apple.com/en-us/HT208891 to install Big Sur Beta. After installation completed, I switch back to Catalina, I found the developer app installed on Catalina won't work, it crashes immediate when I open it. I tried to delete the volume that installed Big Sur Beta, but it's not working, I am still not able to open developer app. Further more, on Catalina OS Volume, there are two new volume was created: Volume with name update appears on desktop, I have no idea what it is. Volume with name disk1s7 appears on disk untilites, I cannot erase it, I cannot delete it. The question is, how to completed remove beta OS from separate APFS volume with the volume update and disk1s7?