Setting up a back button in the toolbar

Hi everyone,
I’ve completed the chapter 11 but I don’t find how to add a back button to the toolbar with the appearance of the default macOS buttons (like back button in Finder). I know that’s possible in AppKit, but I don’t know how to do it using Catalyst.
Can anyone help me?

Thanks in advance.

Best regards!

@rubenfer Do you still have issues with this?