Hi! I believe that you change transitions on a slide by slide basis, so you can do different effects for each slide. You’d need to go to the Revolution plug in, find the slider you want to edit, and click the green “edit slides” button.
Pick whichever slide you want to change. On the page it pulls up, there is an option that is third from the top that says “Transition.” You can change how that slide come in there.
I’m not sure if there’s a way to change more than one at a time!
Disclaimer: I am not part of official support, just have done this bit myself. ๐