@mk7z I’m guessing you hit the shortcut to open it. Even if you have it set to never show, if you hit the keyboard shortcut, it will open. The default keyboard shortcut on Windows would be Ctrl+B. I’m not sure what it is on Mac, but you can take a look through your Shortcuts options in Brave’s settings to see.
Toggle Sidebar is the one that has something by default. If you want to delete that shortcut, you just mouseover it and you’ll see an x appear. Click it to remove the existing shortcut. And you can instead click on Add if you’d like to assign some other key combination to make it work.
Weird, that doesn’t exist for me at all.