Switching from "duration" to "audio markers"

I’m trying to decide the best workflow for developing a FM slide show using the new snippets music. Perhaps just out of habit, but I first time the show with fixed timing for each slide, then drag in a song and switch to using the markers generated by FM. This works pretty well, but sometimes distorts my original timing, which is not unexpected, of course. So now, what do I do? QUESTION: How do I switch between markers and fixed timing when I want to?

Select the range of slides that are above the music, then got to the Slide Options in the sidebar. Then choose from the Continue popup “After Duration” or “At Audio Marker”. This choice will be applied to all selected slides.