Enabling a presenter to lock the video stream for all users who join a meeting, is planned.
Pinning participants is already available – this was tracked in https://microsoftteams.uservoice.com/forums/555103-public/suggestions/19512820
An error occurred while saving the commentJaya Jose commented
A general question I have on pinning users in Teams conversations based on my experience (regardless of whether the 9-screen view rolls out sooner or not):
My current understanding is that you're able to pin as many people as you want (i.e. I can pin up to 4 people). But if I pin 1 person on screen, only that one person shows up on screen (and I don't see 3 other faces). Same thing if I pin 2 people on screen, only those two people show up on screen.
Is there any way to pin less than the maximum # of user screens (for example, pin 2 out of the maximum 4), and have the remaining 2 out of 4 screens "come in and out" based on who's speaking? This would really benefit meetings where you'd like to have the chair / key presenters fixed, but allow other speakers to come in and out.