Panels can’t be resized

OS info

Problem description

Issue is with the “Show Panel”. Pictures are a thousand words.

This is what is showing right now:

This is what displays when I select “Show Panel”:

There are no verticle dividers that I can grab to adjust the panels to the standard/normal configuration.

I am unsure about how I got to this point. Any suggestions would be appreciated on how to restore the app.

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