I have one Word doc open in the main monitor. When I open a second Word doc it opens in the secondary monitor. Not desirable.
I have tried moving the second doc to the main monitor but every time I open a second doc it goes to the secondary monitor.
The following procedure did not work.
This is a brute force approach - in your screen settings disable the second monitor. Start Word and open the document that always appears on the second monitor. It may only appear as a minimized document on your task bar. Right-click the minimized document and select Restore. The document should appear on your primary monitor. Save the document.
Restore the second monitor.