You can adjust the volume of a guest in your meeting by clicking the arrow next to that guest’s name in the Participants panel. Click and drag the Volume slider bar to adjust the guest’s volume.
Note: This feature might be useful to reduce echo in a meeting. Ask the meeting guests if anyone DOES NOT hear the echo. The guest who DOES NOT hear the echo is typically the one causing the echo in the meeting. Lower that person’s volume to resolve the echo.