I accidentally typed a keyboard shortcut and this window popped up. What is it?

I was working in a Scrivener 3.2 Catalina 10.15.7 project called Computer Issues … and I accidentally typed a keyboard shortcut (don’t know which one). The window below appeared. I was wondering what it corresponds to and how it is used.

thanks in advance for your time and help

That’s the Bookmarks pane. See Section 10.3 in the manual for more information.

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thanks very much for your help !