I have been noticing what appears to be a bug with the hide empty elements option.
If I am on a single page and I click on the option in the left sidebar to hide empty elements when in preview mode, and I click on preview mode, the empty elements are indeed hidden.
However, if I happen to click on a link to a different page while in preview mode, any empty elements on that new page then show up (despite hide empty elements being selected for every page).
I can't tell if there is something I'm not doing, or if this is indeed a bug in the functionality.
Any feedback is appreciated!