The tags appended to your post indicate that you have a sixth generation iPad Pro 12.9”.
Ensure you have updated your iPad to iPadOS 16.2. With this version installed, your iPad Pro supports Stage Manager - which allows you to display multiple applications independently on your iPad and connected external monitor.
The [often overlooked] iPad User Guide provides information about this and other features of your iPad and iPadOS. Here is a direct link to the appropriate section of the Guide:
Move, resize, and organize windows with Stage Manager on iPad - Apple Support
The full User Guide is available both online using a web browser (such as Safari), or as an Apple Books download:
iPad User Guide - Apple Support
https://books.apple.com/book/id1567104892
The Tips App, installed by default on all new models of iPad, also leads you to the User Guide. In case you missed it, here is a link to the Tips App:
https://apps.apple.com/gb/app/tips/id1069509450
Apple also has a huge YouTube Channel - containing many videos and feature guidance:
https://www.youtube.com/user/Apple