Video and screeen sharing simultaneously

Hi Alexx1121 

Currently only four Active Participants can be visible in the Microsoft Teams Meeting. Microsoft is working and the feature is due to release with the capacity increased from 4 to 9. 

Feature has started rolling out Globally should be completed by end of May 2020.

Whats New in Microsoft Teams April

https://techcommunity.microsoft.com/t5/microsoft-teams-blog/what-s-new-in-microsoft-teams-april-2020/ba-p/1347929

With Regards,

Satish U