Force restart iPad
There's a way to turn it off using just the buttons on the iPad.
Force restart the iPad
If your iPad doesn't have the Home button, do the following:
In screens that rely on sound or light waves, your finger physically blocks or reflects some of the waves. Capacitive touch screens use a layer of capacitive material to hold an electrical charge; touching the screen changes the amount of charge at a specific point of contact.
How to Unlock iPhone with Unresponsive Screen Without Losing Data
The iPad is a great device for reading, surfing the web, playing games, and watching movies. It's also a great device for writing. The touch screen makes it easy to type on the go.
If your screen is too sensitive or responds intermittently to touch. Restart your iPhone or iPad. Make sure that your screen is clean and free of any debris or water. Disconnect any Lightning or USB-C accessories.
Clean the Screen/Remove Screen Protector If the force restart hasn't fixed the unresponsive touch of your iPad Pro, simply try and clean the screen. Many times, dust and tiny particles of debris can pile up under the screen protector and become problematic.
When you touch the iPad's screen, the capacitors pick up the electrical current signals from your hand. Every point on the capacitor grid generates an electrical impulse signal when the screen is touched and communicates touch-location data with the device's processor. Then the visual display responds accordingly.
If your iPad touchscreen isn't working, the solution might be a simple one. Make sure there's nothing preventing the touchscreen from reading your fingertips, like gloves or moisture. Restart the iPad to see if that solves the problem; it could also be attached accessories, extreme temperature, or a misbehaving app.
If by chance you're not using the stock charger make sure its not too much more wattage than the stock charger. I experienced this same problem when I tried to use a non-stock charger of very high power output. That's an issue normally associated with a cheap chargers introducing noise.
Reboot Your Phone However, it's often one of the most successful ways to fix an unresponsive touch screen on Android. Restarting your phone shuts down and refreshes all background services, which could have crashed and led to your issue.