Address book - recent contacted - users listed here - can not remove

I am using NC 28.02
Contacts 5.5.3

For some reason, my users are being listed in the contacts address book. I have unchecked the “show” system users.

But, the users are still listed. They are all listed under “recently contacted”. I can not edit the users, they are all listed in the recently contacted group.

There is no “show” option to check or uncheck in recently viewed.

How can I not display these users? Maybe how to hide recently contacted?

Thanks for any hints.