A document split into 4 sections

There are two ways to split the current window:

  • From the Menu Bar, go to Window – Split.
  • Using the mouse, grab the splitter control found directly above the document scrollbar

Document Splitter Control Location

But the split command only works horizontally.  If you need to split vertically (see Program.cs:2 in the above picture), try using the Window.NewWindow command found on the Menu Bar at Window – New Window. Then, as in the picture above, go to Window – New Vertical Tab Group.