Master Slide - Change Layout
I've been working on a large tutorial and I see that along the way Storyline 360 has added a LOT of masters and layouts. Most of them are copies of the same one, so I didn't notice they were different. Problem is, now I want to make changes, but it only changes some of the slides because only a few are using that version.
1) How do I prevent this from happening in the future? What is causing it? I've imported slides from other projects - does Storyline copy those even if they're identical to what I'm using? What else brings in new masters?
2) How do I change the layout for an entire scene, group of slides, or project - without changing it on every slide?
3) Does having all these masters affect the performance or speed of publishing?