Showing one Person's Video in Group Meeting

StevenC365  Hi Steven. Thanks for your response to Latif1040, but it is not at all evident how one would "pin" a video, but it's not at all obvious how to do that. Although participants may want to see multiple parties (perhaps including themselves, and often more than four at once, à la Zoom) in a split screen environment, in many cases, they'd want to see only the "active" participant in full screen mode, particularly if it involves a presentation where a quarter of the screen is insufficient to see the presentation. It's essential that all participants are able to make any sector full screen without having to rely on the presenter to make this happen. This is particularly important when viewing an imbedded video, or a video of a recorded Teams session, where there is no presenter to control things. Teams is not exactly intuitive and it's very easy to assume (incorrectly) that users will know how to use it (as there is no apparent Help function or source for tutorials). Thanks for any help you can provide!