Zoom picks up both external mic and laptop mic?!

[EHS1]

When we host a large gathering, we have a separate speaker and microphone. Windows picks up both via Bluetooth, zoom only shows the speaker in the audio controls. On to when we're hosting, it's a large gathering and we have it on zoom for those that cannot be there. We also record the meeting. The people on zoom say they can hear the people controlling the laptop as well as the person on the external mic. How do we silence the laptop users? (they need to speak at times). We tried switching off the audio in windows 11 settings but it switched all the mics off.  Went to Best Buy and they told me it was a zoom problem!