how to record only host, not guest

Hi @degberink thank you for posting for the first time and welcome to the Zoom Community!

In this case, I would suggest recording in the speaker view layout. This view only records the video of the active speaker, with the participant changing as different participants speak. You can view all recording layout options here: https://support.zoom.us/hc/en-us/articles/360025561091-Recording-layouts

I hope this helps!

Carla,
Zoom Community Team

That do not work if they unmute themself. How van you lock so no person is recorded if a participant speak, and only host and cohost is recorded when they speak