Fontsize changed - can't read it anymore

I have loaded GantProject and am just getting started.

Now I have changed the font in the preferences - so small that I can’t read it anymore.
Unfortunately I can’t reset it either.

WHERE they are saved, so I can delete them in the file or reset them to their original values.

Thanks for the help.

Preferences file is .ganttproject and it sits in your home folder. Note the leading dot. Your file browser may hide such files.

It can be so easy.
Thx.