526 votesAnonymous commented
Here is simple work around if you are using two monitors:
1) Set display to "Extended Desktop"
2) Open MS Project
3) Stretch MS Project window across BOTH screens
4) DON'T stretch window to very top of screen or project window will collapse into that monitor
5) Open both project files
6) On View tab, click on Arrange All
7) Drag one project to left monitor and second project to right monitor
There you go!!