I am a bloody newbie in this matter, thus not sure if I understand your kind reply correct.
Does it mean I need to install the latest version? ( I am hesitant to upgrade outside the Linux Mint repository.)
Can I also fix the problem by adding/deleting/modifying some lines in file? If so in which which file(s)?
Are you using the Jitsi Meet electron client or directly the browser?
Which deployment are you using? If you are using meet.jit.is directly from the browser this is already fixed there.
You are confusing 2 different products, the original Jitsi desktop is a Java application used for direct connection between computers on the Internet; it has been discontinued by the Jitsi project and is only updated very rarely by volunteers.
The focus of the Jitsi project is now Jitsi-meet, a server application. It’s used primarily in browsers, and there is the electron application, that is using the Chrome engine to do a very thin embedding of a browser in a desktop application. As it’s an embedding, the code is not fully synchronous with a typical browser, but can lags a bit. As you are using a separate packaging done by a Linux distribution, it can even lags a bit behind the official Jitsi Electron packaging. So while everything globally works the same, some details can be fixed a bit later on Electron (and conversely sometimes regressions are not yet appearing in Electron…)