The last changes plugin shows a summary of the preceding revision and the current revision at the top of the page.
When viewing on a wide screen, the "current revision" is shown on the left, even though the diffs associated with the "current revision" are presented on the right.
The "end revision" is shown on the right in the heading, even though the diffs associated with the prior revision are presented on the left.
Would also help clarity if "End revision" were called "Prior revision" or "Previous revision". I mistakenly interpreted the word "end" to mean the most recent revision on that branch, when that's not what it means in this context.