Currently only entire displays and specific windows (one or multiple of them). But happy to look into this - what would you share only partially for example?

Specifically, I have a 49" ultrawide monitor and a VM in it. If I share the entire VM, other people with smaller monitors see it too small and have to zoom. If I resize the VM, I have to reposition my windows inside it.

It's easier to share a portion of the screen, it's what I do in Zoom. A portion of a window would work too.

Max here from CoScreen. I'm with you, sharing a portion of the screen or window would be very useful for this scenario. I can also imagine running CoScreen from the VM itself, but that would only work for Mac and Windows VMs at this point (Audio and video could still go through your physical machine —— i.e. you would connect with two users). We also have a headless Linux client in the pipeline that could serve to connect the VM directly.

Connecting with 2 users would work. I would still need to resize the window I'm sharing (the reason I have that big ass monitor is to use VS maximized and have everything open), but it's easier than resizing all windows.

I do that all the time in Zoom, to share PowerPoint presentations without exposing the speaker notes on my main screen, and YouTube videos from Firefox (just the video portion, not the "chrome" around it).

Fascinating, thanks for the detailed context. We'll look into it!

I do this using OBS + a dummy plug on my monitor (I run Windows).

1. My dummy plug "monitor" is to the top right of my main ultra-wide - I do this so it's impossible to get "real" windows into it.

2. I have a scene in OBS that has the display capture of my main desktop as a source, and top/left align it with the window.

3. I set my output to 1920x1080 (1366x768 works too but it's a little too small).

4. I set the resolution of my dummy plug monitor to 1920x1080.

5. I use PowerToys FancyZones to set a 1920x1080 zone on the top left of my ultrawide main monitor that I can snap windows to if I shift+drag windows.

Workflow:

In a meeting I make sure to start OBS, and do a Fullscreen Projector of that scene to my dummy plug monitor. (You can add another scene + display capture of your dummy plug monitor if you want to ensure everything looks identical). I then snap whatever window I want to the 1920x1080 zone. I then share my dummy plug monitor to the meeting.

That way you can share what looks like just a window in your meeting but also have the capability to move other windows into the "view" for others as discussion continues and you need to pull other things up without any awkwardness of re-sharing.

This whole setup would be a shitload easier if I could use some kind of simple "transparent window" app and then share that app to the meeting. Or if Teams had "share a region" functionality.

Yea this is kinda nutty as a solution. How often does it break?

Actually works great (as far as I know, haha, I can't see what I'm sharing). Getting it just right was sort of fiddly, and starting up OBS before meetings is a bit of a hassle but it only takes a few seconds.

I'm probably not explaining the entire thing too well but honestly I find it to be an ideal solution to sharing a region of my desktop.