Desktop screen sharing in Jitsi has poor resolution when a demonstrator uses Electron version of Rocketchat client ( v3.9.10)
Broadcasting resolution can be 720p or 360p or even less. With text blured and unreadable.
No problems with Web client of Rocketchat.
Looks like conference with only 2 users is not affected
Three and more - even webcameras give poor resolutions.
When caster quit conference in Electron - cameras became better. Then he rejoin with browser client.