Fixation while Recording

Hey everyone!

When recording my online workshops via zoom, I want my participants to not be visible even if they speak, but only myself. I tried fixating myself and gallery view, but still, as soon as a participant says something, they are full-screen shown in the recording. How can I change that? All I found was to fixate myself, but that doesn´t do the job... Hoping for answers 🙂

Many thanks,
Emily