How make an UI / game layout something like this?

[Axtel_Sturnclaw]

@Manatee;386091

Edit: as for the 99.99% part you said, I very strongly disagree. Thats an attitude that only makes 99.99% of all games 99.99% similar generic mass! And by giving UE4 first for 20$ and then for free, shows that Epic is not only interested in AAA markets, but wants their excellent engine to be used for all sorts of creations and creators.

I agree, I was simply speaking about the way current(and semi-past) market trends may or may not have influenced the decision to not implement such feature. Time is a limited resource after all, and the time spent to implement a feature that currently only a handful of people will use is time that can be used to fix(or implement) features that nearly everyone needs and will use. No argument, just my $0.02.

A cursory look at the source reveals that you may want to start by taking a look at the Source/Editor/LevelEditor folder. The level editor is the window that handles displaying the world in whatever configuration you choose.