Windows 10 has a new build for fast ring insiders. Quite a few updates to the browser Edge. Folders within the Start Menu tiles. Cortana, and a lot more. This is a good sized update!
Windows Theme Management in Settings: As we’ve mentioned in the past, one of our ongoing efforts is to consolidate Settings and Control panel, and we use your feedback to prioritize the convergence into Settings. We’re happy to unveil the next piece of this project: Management of themes has now moved out of Control panel and in to the Settings app. It can be found, along with all your other familiar personalization options, under Settings > Personalization. Pick one of your recent themes, or create and save custom new ones. How would you like to see Settings evolve next? Let us know in the Feedback Hub!