I'm not sure what may be causing the bug. Are you sure you are using 4.3 1885, because we previously had such issue that is fixed now? Also, if you could provide a screenshot or a sample that reproduces the issue, we would be very thankful.
What you can do to hide the button is use CSS and hide the div with class "sflistExpandAllLnkWrp", where the button is situated.
Let me know if this solves the problem.