Click the screen share button at the tool bar below
Select Screen
Select screen in the option list
Allow Screen Share
Choose "start now" to allow Zoom to share the screen of Meetboard
Display over Other Apps
Enable the permisson for Zoom to display over other apps
Complete
Click the arrow back to Zoom
And now all the participants can see the screen share of Meetboard
Minimize
Users now can switch to other apps and exit Teams to let it runs in the background. The screen share process would still continue