How to remotely control iPhone 6 which dropped and right side screen is not working
Turn your phone sideways and use landscape mode. If you are using the software switch you won't be able to do this as it's on the right side of the screen.

If that is the case, connect the phone to iTunes, make a local backup, and take it in for servicing. Either a new screen or a new phone. When you get it back, reconnect to iTunes and restore from backup. Everything will be the same as before.