I also use only the Viewer and the markdown editor and switch between them using Ctrl - L.

I was perhaps too jocularly dismissive in my previous post but I honestly don't understand what the fuss is about. There are 2 menu commands.in the View menu. One is Toggle Editor Layout - which has the keyboard shortcut Ctrl - L. The one under it is Layout Button Sequence which remembers your choice and then determines what happens when you toggle.

I do not find this at all confusing and the choices mean that almost all possible variations are available. At some times I have experimented with toggling between the Viewer and the Split Layout. Lately I have felt that I prefer to toggle between Viewer / Editor. I changed my preference with one click.

As I said before I find the Viewer very important. There are more times I want to read notes than edit them and the Viewer treats the note like static text and prevents me accidentally editing or deleting. The iPad version has a similar idea with a different triggering mechanism. It too has a view-only mode and a big button that opens an editing screen.

We could perhaps discuss which interface seems most intuitive - while bearing in mind that both offer a read-only mode.