Advice from the Intelligent Toasters blog on how to do tented vias in DesignSpark PCB software:

Retro CPC Dongle – Part 37

Tented Vias – who’d have thought they play such an essential role? If you have no idea what tented vias are, then you’re not alone and I’m here to enlighten you.

https://intelligenttoasters.blog/2018/08/28/retro-cpc-dongle-part-37/

https://intelligenttoasters.blog/2018/08/28/retro-cpc-dongle-part-37/

https://intelligenttoasters.blog/2018/08/28/retro-cpc-dongle-part-37/