Openmeetings600 on the ubuntu20.04 server and desktop.
OS:Mac OS Sierra 10.12.6
Browser : FF87,Chrome89 and Safari12
OS:Windows10 is any browser same issues.
In Local area network. This is a test server.
In any room, the left side of folder explorer is no-display. Camera and shear window are fine.
And other issue is popup windows can't close on any browsers.
The ubuntu20.04 desktop side of FF browser is fine. it is no problem.