Lenovo YOGA Tabler 2 Pro Guide De Démarrage Rapide page 7

Using the projector
Use the projector feature as shown.
Step 1. Press and hold the Projection On/Off
button to turn on or off.
Step 2. Lay the tablet on its back with the
kickstand out, and adjust the angle
of the kickstand until it can stand on
a table.
Step 3. Move the Projection focus slider left
or right to adjust the projection focus.