NewMicrosoft Teams
Microsoft Teams: Two presenters can share their screens or windows simultaneously in meetings
Microsoft Teams meetings will support simultaneous screen/window sharing from two presenters, allowing participants to view both content streams at once for easier comparison and discussion.
Microsoft's description
Two presenters can share a screen or window at the same time in a Teams meeting. Participants can see both shared content streams simultaneously, making it easier to compare and discuss content from different presenters.