I have an iMac (late 2015) running the latest version of Catalina. Recently I went to the App Store to check on some of my purchases and was surprised to find that there were no longer listing any apps. I checked my account and I had no hidden apps. I have rebooted my Mac and ran Onyx to no avail. Also I tried signing out of the App Store and re signing in to no avail. Any help you could give me would be greatly appreciated.