You'll need to use the MMC Certificate Manager for that.
Run certmgr.msc
, open the tree to find Trihedral OPCUA Untrusted | Certificates
, select the certificate you're not fond of and click the delete key.
Hopefully this image helps:
You'll need to use the MMC Certificate Manager for that.
Run `certmgr.msc`, open the tree to find `Trihedral OPCUA Untrusted | Certificates`, select the certificate you're not fond of and click the delete key.
Hopefully this image helps:

Software Developer with Trihedral