Title Explorer cutting off content area

Upon opening my Lectora file, the Title Explorer is overlapping the left-side of my main content area - i.e., the stage where my graphics and textboxes are. Even if I drag my Title Explorer left or right, it's stil overlapping and there's no horizontal scrollbar below the stage allowing me to see the entire stage. I have never seen this before and I'm thinking I must have activated a property/setting with a set of keystrokes. I restarted Lectora but that didn't fix it. It's happening with all of my AWT files. Is this familiar to anyone?

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