Thanks for your response, Christopher. I have tried this on both the web-based version and the PC version of Teams but have not been able to make the pane disappear. Was there anything else that you did?
Wow, always learning new stuff...I have not noted this option either. For what I see, the option is not always there...for instance it's if you are in the Files Tab or in other Tab you have added (such as a Planner Tab), but it's not if you are in a channel conversation so I guess this can be something specific to the Tab you are using