Seem’s that this should be an easy toggle from looking at this file: openvidu/Screen-Capturing-Auto.js at 183f699eabb500444ea088ad80489abc009733af · OpenVidu/openvidu · GitHub
When requesting screen share the constraints there needs to be an option to toggle {audio: true} (Using the Screen Capture API - Web APIs | MDN)
It doesn’t seem you can get this to work without overwriting the file.
This would preferably be a simple addition to the publisherProperties.