#display to the end of the address. Move that window onto the projector or smartboard and make it full screen. Keep this window on your laptop and tap through the tablet. The display follows along. Add #teacher instead to show only the tablet. In the live portal, the smartboard and the teacher's tablet pair with the room code on screen, so they can be separate devices.
Sample practices for demonstration. Each practice runs about 10 seconds here; in the portal every practice plays at full length from Bud to Bloom's Vimeo library. Check-ins you log are kept in this browser so you can see the week build up.