just upgraded. Camera raw opens in the wrong monitor... and I can't drag it back to my main monitor.

Try resetting the Camera Raw preferences:
Hold down the Command key and select Photoshop > Preferences > Camera Raw (macOS) or hold down the Ctrl key and select Edit > Preferences > Camera Raw (Windows).
Click Yes in the dialog that asks "Delete the Camera Raw Preferences?"
See also:
https://helpx.adobe.com/camera-raw/using/camera-raw-settings.html 

(and in the future, to find the best place to post your message, use the list here, https://community.adobe.com/)

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post if it helps you get responses.

<moved from using the community>

Hi there,

Thanks for reaching out.

Could you please let us know which operating system you are working on? How to set the display

Also, you can try changing the primary display; please check the links below according to your operating system for the steps:
https://answers.microsoft.com/en-us/windows/forum/windows_7-desktop/how-to-set-primary-monitor-in-ex...

How to Set Primary monitor in Extended Desktop - Microsoft Community

Set the Primary Display on a Dual-Screen Mac Setup

Regards,

Ranjisha