Microsoft has announced a new feature in Teams: screen share from chat policy. Screen share from chat allows you to immediately start sharing your screen in a 1-1 chat or group chat. This entry point was previously governed by the AllowPrivateCalling policy. If this policy was disabled, users weren’t able to screen share from chat. The option to start a screen share from chat will now be governed by the ScreenSharingMode policy. This way you can control the way users can share and have private calls more easily. This feature will be rolled out May 2020.