Unable to pin participants on Linux Mint

[s-n-ushakov]

Hi, I use Zoom under Linux Mint, and it was recently that I lost ability to pin group chat participants.

The "Pin" menu item is still available, but nothing happens when I select it. Participant layout does not change.

My Zoom version is 6.4.6 (1370), installed as Flatpak.

Any ideas would be most appreciated...