Hi RD08,
Thanks for your post on the community forum. I'm Nik, an independent advisor here to assist you with this.
Could you please share with me the screenshot to understand what are you referring to when you see “System border” and “Titlebar”?
This will help me to look at the specific information available in Teams for Linux.
If this question is regarding changing the Teams app layout, then I’m afraid it is something that is not possible. At this point, the Teams app comes with a default layout with no option to change it.
Regards
Nik