HowTo Check used application version - robert7/nixnote2 GitHub Wiki
Open menu "Help/About".
Version info is like 2.1.0* (e.g. 2.1.0-beta3)
Depending on the packaging there maybe additional suffix. If reporting bugs best is to write version number in full exactly how it is displayed.
For git tags see: Releases - versions, build pipeline, branches, tags...