Rounded UI is my second substratum theme in terms of number of downloads. The idea is simple: rounding all elements of the themed apps.
Round it! This is Rounded UI Pie/Oreo/Samsung/OxygenOS theme for Substratum theme engine. The aim of this theme is simple: giving to your rom a unique look with rounded borders to many items! Dialogs, popups, notifications, recents app, cards of many google apps and much more!