No worries, and sorry that it takes time. Not from lack of trying. I’ll find a good solution, though, and notify you when I have it.
Hey, sorry for the late reply. Check out the login menu map in Maps/Multiplayer for an example of how to login from a menu. The basic steps are to create a widget for your menu, add it to the viewport through the BeginPlay event of some blueprint (possibly the level blueprint). Then you can bind an event to a button or something else, which you can tie to the OpenLevel node.