I need to redesign an old PCB and for that I want to put down a open copper plane that won't get covered by solder mask.
I tried it by creating a rectangle in the 'Pads'-Layer. The PCBs just arrived and.. well they are covered by soldermask.
I also tried the answer to this question but now my placed rectangle is gone and I can't see it anymore.
So the question is: How do I create a copper plane without soldermask?