Duo remains one of Google's most minimal apps, so it feels like even small changes were carefully considered before earning a place in an update. The latest version of Duo is rolling out now with one such tweak that allows the on-screen controls to disappear when they're not in use. A teardown also reveals plans to make audio calls even more resilient on low-bandwidth connections and to add a couple of notifications that might give users more reasons to open the app more often.