You need to alter the panel.cfg to do that. That means adding another Panel.xx folder with the original files copied, but then alter the new cfg file. Look at the last sections will be [VPaintingnn]. One of those will be for the exterior. The last line of that section will be something like this:
painting00=Registration/Registration.html?font_color=white, 0, 0, 1024, 256
Change the last two numbers to zeros, and the exterior registration will be rendered two small to show on-screen.