I'm trying to make a guard trace around an op amp's in+ pin.
The datasheet says "Solder mask should not cover the input and the guard area including guard traces on either side of the PCB."
I have looked around in the editor and haven't found a way to remove the solder mask from specific traces or parts of the board. I assume there is a way and I just haven't figured it out. I have played around with the keepout and mask layer, but they seem to be the opposite of what I want. Any suggestions in the right direction would be appreciated.