It's easy to trend Previous Page (not Previous Page Flow) in Reports & Analytics. I use it all of the time to understand traffic changes that occurred to a given page.
Is there a way to trend Previous Page in Workspace as well? From the Flow visualization I can select one path and trend, but I need to see at least the top five previous pages at once over time like in Reports & Analytics. Also I tried selecting "Try in Workspace" button from the trended version in Reports & Analytics, but it didn't translate the well.