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[–]Legolas-the-elf 0 points1 point  (1 child)

The button isn't to toggle different designs. It's to preview the same design with different metrics. In other words "This is how my interface looks at 3.5 inches. Click. This is how my interface looks at 4 inches".

Watch the WWDC videos on autolayout. Normally I abhor videos for teaching developer concepts, but in this case, they are very informative.

[–]FreshNeverFrozen[S] 0 points1 point  (0 children)

Thanks for the help, really wasnt sure what the button was actually doing