If your problem is scrolling, use the toolbar buttons to navigate between changes.
Looking at the code of org.eclipse.comparator.internal.CompareEditor
(which is the name of the class of the editor illustrated in your question), I do not see any indication of a different "orientation" (horizontal layout vs. vertical layout)
So, no. I do not think the current implementation allows you to compare files with a different layout.
One way to overcome your problem is to Maximize
editor window during file compare, and then Restore
it after compares are done. I wish Eclipse did it by default.
As to the question of orientation. I think it's more readable when you compare revisions side-by-side. That's probably why Eclipse authors did not give us an option of horizontal layout. What they could have given us were a line diff at the current cursor position.
I guess Robert was referring to Select Next/Previous Change/Difference buttons (see section Toolbar in Eclipse Help).