Chill vs. Beast dashboard mode
This one doesn't touch your public page at all. It only changes how your dashboard looks and feels while you're editing.
Chill keeps things simple and spaced out, good if you just want to drop in, add a link, and leave. Beast surfaces more controls and density at once, good if you're in there tweaking constantly and don't want extra clicks between you and an option. Switch whenever, it's not a one-time decision.