Hi Salamander80,
Welcome to Apple Support Communities! We'd love to help in any way we can with your question regarding your iPad.
While there isn't an option to extend the screen of your iPad onto a second display, you are correct that your iPad features split screen and other multitasking options. We'd like to share a great support guide with details all about multitasking options:
Use Multitasking on your iPad
We'd also like to share a link with great information about how gestures and other options to easily copy and paste text and other content:
Cut, copy, and paste between iPad and other devices
There's one alternative option that we want to be sure to mention as well. If you own an iPhone and are signed in with the same Apple ID, you may consider using the Universal Clipboard feature to copy and paste content between your iPhone and iPad, so that you can have a different app open on each on. Here's a link with further details:
Use Universal Clipboard to copy and paste between your Apple devices
We're here for you if you've got any questions.
Have a great day!