Solution to maximize and minimize window
Solution to Maximize and Minimize Window Open pcb-gcode-setup.ulp file Remove or coment the lines 512, 513, 514 Save file.
this seems to be an issue with the logo image, line 513, edit the image source to docs/images/pcbgcode-600.gif width='300' and line 570 edit the image source to docs/images/isolation_settings.gif width='300' and finally edit line 661 the image source to docs/images/z_axis.gif width='300'
you only need to remove the single quote around the img src name not width
With what Eagle version did you run into this issue? I can only get pcb-gcode to work with Eagle < 8.x
9.1.1