Screen sharing fades and reappears

Hi everyone,
i have installed jitsi version 2.1-508-gb24f756c-1 on ubuntu 20.04.2 LTS and i have problems when the users share screen, instantly the screen fades, and after of seconds the share is visible again.
For solve this problem, Do I need to update jitsi version? or Do I Need to do some settings?

Best Regards.