Did you already try all hints from https://docs.syntevo.com/SmartGit/HowTos/Running-on-WSLg.html?

The used GUI library (SWT) and hence SmartGit only supports one scaling for all monitors. SmartGit only supports images at 100% and 200% scaling.

It is there - see the Hamburger menu. You need to unselect the Compact mode.

Do you change all 35k files in the commit or do you have enabled to show even the unchanged ones?

By default, for a file log, the file is preselected in the Files view. Why hide all the other files?

If it is about commits, just select the two commits to compare.

Already implemented in 22.1:

Disabling is not possible (and probably won't), but maybe the preferences option "Preselect 'Staged' if files are staged, even if a file without staged changes is selected" helps you. I also recommend you to select View | Separate Working Tree and Index.

Done in 23.1