Please follow the steps below to have your computer show on the second display through your projector.
STEP 1
Switch the input source to PC/YPbPr on the projector.
STEP 2
Connect your computer to the PC port for VGA input.
STEP 3
Connect your second display to Monitor Out for VGA output.
STEP 4
Go to OSD menu > System > Standby Settings > Standby Mode > Normal