How can two users share their screen to each other simultaneously?

I haven’t been able to find a screen sharing software where multiple users can share their screen (specifically, an application window) simultaneously while being able to see the other users’ shared screens.

It only needs to support two users: user 1 sharing his screen to user 2, and user 2 sharing his screen to user 1.

For example, I tested Zoom, but while Zoom allows sharing multiple screens simultaneously, those users who share their screen can’t see the shared screens of the other users (because the Zoom window hides itself while sharing one’s screen). If user 1 and user 2 both share their screens, only other users in the meeting (user 3, 4 etc.) can see both screens.
https://support.zoom.us/hc/en-us/articles/115000424286-Sharing-multiple-screens-simultaneously

Other screen sharing software solutions that I’ve found do not advertise this feature. I haven’t been able to find any article about this use case either.

I guess I should mention that there is one solution we’ve found: use two different screen sharing applications simultaneously. For example, user 1 uses Teams to share his screen to user 2, and user 2 uses Zoom to share his screen to user 1. Very cumbersome and performance hungry, though.