I love that thing to death. Also using a screenshot utility to save trends for sharing or later review. Yeah, I know you can save the data too, but the visual is often adequate.
You know you can archive the trend view (not just the CSV data), then "import" it back into Designer and use the Trend View to re-visualize all the data at w/exact time stamps.
It's basically a permanent Historical Trend View of that archive.
Just hit the RECORD button on the Trend View. Then hit STOP at some later point in time. You will be prompted to save as either/both a Trend Archive or as CSV text.
Later, in another Designer session, do File->Import->Trend Archive. It loads it as a pseudo-project file with no program and the historical Trend View that you can scroll, zoom, click, analyze, whatever.