I'm using Xcode 13.2.1 on a MacBookAir (13-inch, 2017) running MacOS 11.4 BigSur. I'm working on the playgrounds that come along with the Develop in Swift Program but when I'm going through the exercises nothing shows on the LiveView bar on the right. In the activity bar it's stuck saying "Running playground name" with the blue wheel spinning endlessly. Anyone else having the same problem? Any suggestions?