Hello.
What I am talking about is that in standard layout, there is a button I can press to add or remove all the navigation tabs. As you can see below.
If I could find that same button in the columns layout, I would guess that it might remove all the navigation tabs and it woul look pretty much like the standard layout. My guess is that it would discplay or conceal the section in red below...
As you can see, never use the preview and do my best to conceal it. I prefer the spacebar feature that you offer.
Awesome product, BTW.
all the best,
.p