Unfortunately our users tend to miss the 'Unpublished changes!' yellow warning bar.
If it floated as you scrolled down the list (like the 'Back to top' button and Table of Contents/Filters do), it would be more visible and obvious to users.
Hi Sarah, update: the dev team is looking at your suggestion already.
We have a rolling publish button enhancement planned in near future. I have added the unpublished changes warning scenario to be addressed that piece of work.