The lines of my Gcode windows are too big, so they overlap.

How can I change the size?

My screen is set to 1024x768

I have tried in all setups and the same. I have tried with Screen4 but I can't find what to change.

Any help appreciate.

Sounds like you have Windows set to use large fonts.
Changing the # of lines in Screen4 will change the size of the font, but it won't cause it to overlap.