1. Click the gear at the bottom right corner
You’ll find you can do things like select a particular slider frame, then click the “disable” checkbox, and begin editing and figuring out your CSS needs for that one elusive frame. Or if you just want to work on other stuff on the page without all your fancy things moving around your problem is solved.
Note: You’ll have to have it unchecked to load the page correctly for certain things, I noticed if I refreshed my slider’s navigation would not appear, and as i needed to edit slide 5’s CSS i had to uncheck the option, load the page, choose slider 5 and then check it off again.