Hi there, ndrewZychowicz.

Thanks for reaching out to us. Allow me to help provide some details about the Multi-Monitor mode in QuickBooks Desktop. 

There are some QuickBooks windows where you can drag and transfer it to different monitor such as the Preferences window. However, the messages or warnings notifications will automatically pop-up on where your QuickBooks open and there isn't a way to move it to a different monitor permanently. 

For additional reference, you can check this article to learn more on how to Use QuickBooks on multiple screens or in Multi-Monitor mode. 

Please know that you're always welcome to post if you have any other question about the multiple screens. Have a good one.