How to show file explorer button after closing it?

Top left corner buttons: (Ribbon Collapse), (Search), (Bookmarks). There was another “file explorer” button that showed me all my folders/ notes. I right clicked that button and hit “close.” How do I bring that button back so I can see all my files again?

What I’m trying to do

Unhide file explorer button after closing it.

Things I have tried

Right clicking a bunch and looking through all the settings.

It’s under “Core Plugins” and there is a little toggle button for it. Got it.