Previous button - to the previous slide in the sequence of slides or the last slide visited?

I'm getting ready to go through my course now to set a trigger on each slide to set PREVIOUS to go to the previous slide in the sequence rather than the last slide visited. Need this because when users choose a slide from the menu they get thrown off when PREV takes them back to the earlier slide (often in another lesson) rather than the previous slide in the current lesson.

I seem to remember a thread about an option of 'previous slide visited' or 'previous slide in the sequence'. Does anyone else remember that? And, yes, we would have to have use triggers to move from one lesson to another, but that would still be a lot less work than a trigger on each individual screen.