Hello!
Use top solder mask layer and bottom solder mask layer.
Regards,
Markus Virtanen
HW / Electronics Designer
This may help you understand how to use the SolderMask layers.
[https://oshwlab.com/andyfierman/how-to-make-an-aperture-in-the-solder-mask](https://oshwlab.com/andyfierman/how-to-make-an-aperture-in-the-solder-mask)<br>
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Remember that a shape in the SolderMask layers **removes** solder mask so that the shape creates an aperture in it.
I finally found the solution!! Just right-click on the trace, then click "ADD", then add the solder mask region.
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