You only need to expose the copper where you want to solder something to it. If you want to use copper as a heatsink then you should probably design a footprint that includes a pad and thermal vias. See: [https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6](https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6)

The other thing you can do is to create an aperture in the solder mask layer: [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)

<font style="vertical-align: inherit;"><font style="vertical-align: inherit;">@andyfierman Thank you very much Andy, finally i copy that :)</font></font>