After months of living with the developer preview, we’ve got a pretty good handle on what’s in Android 8.0 Oreo. Still, some surprises are lurking inside. For example, the use of so-called “Task Snapshots” in Android 8.0 means your overview thumbnails will look better, use less memory, and actually represent what you see upon returning to an app.
A Task Snapshot is an infrastructure feature of Android 8.0, so there’s no setting to mess with on your end.
Android Oreo feature spotlight: Task Snapshots allow for higher quality, more accurate overview thumbnails was written by the awesome team at Android Police.