Shopify's admin interface is getting a new look starting September 15, 2026, rolling out progressively to merchants. The changes include new color, type, spacing, and icons across every page, inside a new frame. Search, notifications, and the store picker move to the side navigation, which collapses for more room. Sidekick moves from a side panel to a floating chat at the bottom of the page. For apps, Admin UI extensions and App Home UI extensions automatically receive the new styles. Apps that render their own interface in App Home keep their current styles until they choose to adopt Polaris 2.0. Functionality does not change, and extension code does not need updating to adopt the new appearance.