Recording only speakers

Hi,

I have an event coming up and I want to have two video options recorded - 1. Speaker view 2. Speakers side by side

There will also be a gallery of participants who will have the option to interact with the speakers but we do not wish them to be seen in the video, only hear their voices.

i checked the boxes record speaker, gallery and shared screen. I next unchecked the gallery option, however, we got one video which was great and switched from speaker to speaker, but the other was full gallery. 
Both speakers were made host and co-host and we also pinned them.

What else do we need to do to avoid showing the gallery of participants? 
spotlight? 

thank you 🙏