Synchro- Interface

[blinkfeuer]

I reinstalled Linux Mint 21.1. Now I no longer see a user window with left and right file entries, only the tiny one . I can't use that. Several years it was 1st choice for me, but now? Not good:
My wish:

[Plerry]

You are showing a RealTimeSync (RTS) GUI window,
From your description, it seems you are looking for the FreeFileSync (FFS) GUI window.
So, simply open FFS instaed of RTS.

[blinkfeuer]

The Mint version shows the window above. I took an online tar.gz version and everything runs now.