I already tested the visual keyboard and it doesn't work either :(
Okay. First please make a save of your TAPE data with CTRL+S
Next you are looking for a .localstorage file that should be somewhere like C:\Users\<you>\AppData\Local\Tape
If you delete this and start TAPE it should revert the zoom back to original.
It worked. By deleting this directory I reseted evrything, thanks !
Anyway a "Reset options" function would be nice for a future update ;)
Thanks again for your help !