I am converting from a 4 layer to a 2 layer board.
I have done this before by setting “4” to “2” in the board setup, filling the top layer as GND and then some expected touch up.
This works fine but all of the GND vias connecting to the former middle layer remain. I am not sure what layers they connect but I hand delete them all. Wanting to automate this process I tried the
Edit: Cleanup Tracks and Vias: Delete Redundant Vias
This does not seem to remove the vias.