Remote control of iPad pro from another touchscreen display
Unfortunately, Apple does not allow remotely controlling an iOS device, but if you are jailbroken, you can use the Veency tweak:


Open Cydia to search for and install Veency.
Respring when prompted.
Go to Settings > Veency and choose the settings you want.
Figure out your IP address by going to Settings > Wifi > click the "i" next to your currently connected network and the IP address should be listed there.
Open up a VNC client on your computer and connect to your device by inputting the IP address when prompted.