How to Open Two Microsoft Project Files Side By Side

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Here’s how to do it: 

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1. Launch MS Project and open the file you want to work with.
2. Now, let's open a second project file. From the current window, navigate to the "File" tab in the top-left corner.
3. Browse to locate your second project file. Select it to load it in a new window.
4. Click on the "View" tab in the ribbon.
5. Then, find and select "Arrange All" in the "Window" group.
6. Both project files are now displayed side by side. You can adjust the divider between them by clicking and dragging to resize each window as needed.