According to the HIG, - https://developer.apple.com/design/human-interface-guidelines/macos/windows-and-views/popovers/ changes in popover size should be animated: Animate changes in size to avoid giving the impression that a new popover replaced the old one. How can this be done in SwiftUI? No matter where I put .animate() annotations, I can't get the actual popover frame to transition smoothly. Best I can get is that the popover frame changes immediately, and then the controls awkwardly animate over to the right location.