change viewport layout Yohoo!:)

As a 20 + years user of kind of every cad app on earth i am super amazed i have to ask this question! 

How do i change the viewport layout? Like, in any way at all..

I manage to add more duplicate windows(why is it even possible to do that?) and then they cant be removed. I cant move any toolbars to anywhere. 

Heeeeeeeeeeellllllllppppppppppp :)
I know it can be confusing, so here we go :)


Flip the header - Right click on header > Flip to top
Remove Status Bar - Window > ✓ Show status bar
Use current layout for new files - File > Defaults > Save startup file


Flip the header



Remove status bar - pretty useful to keep, shows total/selected geometry and available shortcuts