I submitted this feature request: RSRP-501236 Auto-format on typing quote

The most convenient option currently is to enable the "Reformat on Save" (File | Settings | Tools | Actions on Save).

Ensure this setting: File | Settings | Editor | Code Style | C# | Spaces | Assignment operators is enabled.

So, now, upon saving a file (Ctrl+S), the spaces you didn't enter would be added by a formater.

Another option to trigger reformat is to delete/enter the closing brace in the end of enum declaration.

Have a nice day!