With the release of the Windows 10 Insider Preview Build 20241 Microsoft has improved the defrag experience and brought theme-aware app splash screens.
The new settings can be found in the Optimize Drive Settings page, featuring the Advanced View checkbox.
The theme-aware splash screens are supported by the next apps: Settings, Store, Windows Security, Alarms & Clock, Calculator, Maps, Voice Recorder, Groove, Movies & TV, Snip & Sketch, Microsoft ToDo, Office, Feedback Hub, and Microsoft Solitaire Collection.
