Reinstalled
uninstall macOS Catalina and reinstalled?
Question marked as
You'd have to erase the Disk then...
Command (⌘)-R
Install the latest macOS that was installed on your Mac.
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
Shift-Option-⌘-R
Install the macOS that came with your Mac, or the closest version still available.