According to my chat with customer service this afternoon, the changes on the Profile page are permanent. The changes will, I'm told, improve the zoom function. Epic fail. Zoom in a bit, and the dates jump over into the event column, in a large font between the small-font event header and the small-font location. Zoom in a bit more and the right sidebar disappears off the screen until I zoom back out - I can't even scroll over to it.
I can't fathom what Ancestry's long-term goals are, but questionable aesthetics seem at the forefront and functionality seems low on the list.