Can I change a circle subtopic to a page subtopic?
You can’t change from a planet to a stack, but you can copy the contents of your planet (circle) to a new stack (page).
If it’s just the circle surrounding the content that you want to get rid of, make the circle transparent or change the circle topic cover from Inside and Outside to Visible outside only. If you change the topic zoom area you can get it to look just like a stacked page without having to redo it as a planet.
You can learn tricks like these in my Master Prezi Next course.
Robin, Prezi Instructor at TeachMePrezi.com