I was wondering if there was any way to expose a portion of the traces like in this image?
Just draw the desired shape on the F.Mask layer.
In your example this would be a filled circle.
The linked to image:
Making something like that is quite possible in KiCad, but it is not “just exposing some traces”.
The proper way to do this in KiCad is to make a footprint for it in the Footprint Editor, which has all the “fingers” of the buttons (as parts of pads) and to use an aperture pad for the round cutout in the solder mask layer. Once you’ve done that, you can link that footprint to a schematic symbol and use it as many times as you want on your PCB.
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