MacBookPro15,3 running macOS 10.15.1 (19B88) with Roon 1.6 (Build 475)
Running over wifi via Linksys Velop network running firmware 1.1.9.195026. All nodes up to date.
Using Apogee Grove DAC via USB
Had to re-install Mac Catalina operating system as it became corrupt and would not consistently operate. Restored my Mac data via a Time Machine back up. Been stuck at Roon login screen since. Also tried a restore from within the Roon app from both my Mac hard drive and a copy of a Roon back-up I keep on my iCloud Drive. Neither worked.
You should be fine going into your Applications folder, selecting Roon and moving this to the Trash. Then from Finder, click Go and press the option key and select Library from the list. In the window that opens look for Roon* and move this to the trash.