The following
describes how to remove a CA certificate.
In the web UI, go to Administration > Certificate Management > Certificates. In the native UI, go to Tools > Certificate Manager or click the Certificates button in the
tool bar.
Right-click the intermediate CA certificate or root CA certificate in the tree
pane and select Remove > CA Certificate.
Click Yes.
If the certificate had a certificate chain, click Yes if
those certificates should also be removed (if they are not referenced by any
other chains).