1. Select a via;
2. Right-click > Find Similar Objects...
3. Find;
4. Cancel;
5. Objects Attributes (right hand panel) > Expose Copper;
6. Layers and Objects floating panel > hide all layers except top and/or bottom solder mask;
7. Check that apertures have been created over the vias on top and bottom layers.
Note that this does not create apertures in the paste mask layers.
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