The old Webflow approach: switch to each breakpoint, check it, switch to the next, check that one too. Repeat for every single change. Webflow just killed that step. Expand canvas puts every breakpoint on one screen, so a change you make once shows up on desktop, tablet, and mobile at the same time, no switching required. Half my QA process used to be tabbing between breakpoints hoping I didn't miss anything. Small update on paper but it's one of those features you use once and can't believe you built without.