Make iPad Pro Screen Bigger with External Monitor?
Other than specific apps that support multi-screen mode, the iPad will be exactly mirrored. The iPad doesn't care if it's a 7-inch or 70-inch screen, and it will only mirror. The apps that support an external display are few and far between, and there are probably only a single-digit number of them. I'm sorry if your goal was to get more space on an external monitor using an iPad, but it won't happen natively (I guess it could happen with jailbreaking?).