Search results for inner layers layer is invisible

Convert 2 layer to 4 layer PCB

... layer board. I would like to now make this board a 4 layer board. The 2 inner layers will be ground planes only. When I try to add a fill I get error, "This layer is invisible". I have inner layer 1 and 2 set in layer settings. Is this possible to do? Am I missing a setting?. Click on the littl...

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