I don't know why it was removed but
works like how the old XF 1 more options button do. If you really want it, maybe make a template modification to add the button back.
It should be $canChangeName. There's a typo somewhere in the template.
When I edited the template, it would work fine. Just a typo somewhere either the template or the code. Depending on how the owner of the add-on want to fix this.