Hide "var" type preview in new IntelliJ 2020.2
I found it. CTRL+ALT+S then search for Inlay Hints and select Inlay Hints -> Java -> Implict types and turn it off.
Wish it was pre-disabled because now I will have to turn it off everywhere.
Disable Settings (Preferences on macOS) | Editor | Inlay Hints | Java | Implicit types: Show hints: