I assume it’s the perspective/trapezoid look you’re after?
If so, then take a look at 3D Widgets, which are covered in this tutorial:
I also suggest that you look into the Horizontal/vertical boxes and Spacers in the UE4 Widget designer. These allow you to better organise and manipulate your widgets.
This tutorial creates a multiplayer lobby menu using some of these feature, so it may be useful to you: https://docs.unrealengine.com/latest/INT/Videos/PLZlv_N0_O1gYqSlbGQVKsRg6fpxWndZqZ/Wi6ZPawtNdE/