Microsoft may replace the Start button with the Copilot AI in Windows 12

First and formost I found this video that might help you out explaining how to set up dual monitor for linux, I have never had two myself but it seems like a good video to get you started

1. Try the 'display' program preinstalled and see if one of the settings helps you out
2. You may need to install graphics drivers if you have not already, open the perinstalled 'driver manager' app and see if it detects anything needing done.
3. make sure your update manager has everything up to date. open the 'update manager' app and see if anything needs done.
4. browse through a little of the documentation for xrandr command and see if something rings a bell.
5. If those options fail, open the 'welcome screen' app preinstalled and click on the 'help' section in the left hand side of the app. From there click on the launch button for the IRC chat room. It will open up a program to directly talk with very knowledgeable Linux mint community volunteers who will be more than happy to further help you in real time. Keep in mind depending on time of day or circumstance you may have to wait a little while for someone to be available.

I feel bad that you encountered an issue right away, I hope you have quick success in fixing it.