Linux user doesn't have access to chat with right-click action

My strange problem is that when a Linux user tries to right-click on the host/co-host video/tile, they do not have an option for "chat" like the users of Windows or macOS.  It seems to be specific to the Zoom Pro account that I have, but when checking this out on another Zoom Pro account, the Linux user does have the option to chat when right-clicking.  So it must be in one of the settings on my Pro account.  But how could a setting permit this feature (right-click has "chat") for two operating systems (Windows and macOS) and not the third (Linux)?  I've gone through all the settings and can't see any that directly effect chat not being available in a right-click operation.  Anyone have a suggestion?   Thanks, John