Sub Menus In Off Canvas


After a frustrating morning, I’m tearing out what little hair I have left.
I have added an Off Canvas menu bar and all has gone well, with the exception of adding a sub menu (I think).

What I’d like to achieve is this:

If I click on Newsletters, all I can access is the Newsletters Archive underneath, and not the Newsletters page - if that makes sense. The Newsletters Archive does need to be nested.

I’d like to be able to access both Newsletters and Newsletters Archive.

I have messed about with loads of settings and I just cannot fathom it out.

Any help (and hair) would be great.