It would actually be more helpful if you posted a screenshot of your entire interface, but the Project panel can be found from Window>Project (KB shortcut "Shift+1")
It would actually be really helpful if you could post a screen recording of your entire monitor showing this happening. That would go a long way to solving this issue quickly.
Thank you, both David and Jim for your help. The issue seemed to resolve on its own after I was able to reopen the main sequence from the project panel. I appreciate your willingness to help though.