UE4.10.4 Opening 2 Levels at once

Stumped on this one, no idea what I can post up to help.

I created a new level for a menu and placed a widget in it, when I click play however, both that level and my game level open at the same time, so I’ve got a menu over the actual gameplay.

When I make new empty levels, the game level still opens.

I changed the default level in Edit → Project Setting → Maps & Modes, but that changed nothing.

Is it something to do in my Game Mode BP?

Thanks