Do you mean have a copper track which is exposed because it is not covered with Solder Mask?
If yes then route the track then press "Create Solder Mask".
As already explained:
"...route the track then press "Create Solder Mask"."
![image.png](//image.easyeda.com/pullimage/zacjMVCbYyqDBrTGKYXMiXOwPa6nzpbdnDqQTmZc.png)
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