Thank you for your continued feedback, we have not forgotten about this ask. We have a feature on the backlog for popping out content, so you will be able to see one screen with the video gallery and one screen with the shared content. We will share an update as soon as one is available.
For the separate feature ask for full screen option, please upvote and comment at https://microsoftteams.uservoice.com/forums/555103/suggestions/41277121
For split screen camera and desktop, please upvote and comment at https://microsoftteams.uservoice.com/forums/555103/suggestions/37118773
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The video and user icons show up on top of the bottom right corner of screen share in the mobile Teams app. This overlaps and obscures the slides. There is no option to reposition or remove these windows.