Logging domains, but not clients.

[yubiuser]

You can't. But you can vote for the relevant feature request:

Additional Privacy Level: Hide Clients but show Domains

Hello, It would be nice to have an privacy mode to only hide clients. I want to make an outside project, but i need to hide the IP because of the GDPR. I still want to know where the traffics goes/to which sites. That wouldn't interfer with GDPR. Today it's only possible to hide IP with domains alongside.