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This is where all of the Windows Defender settings were located prior to the Creators Update.
The Windows Defender Security Center opens by default on this Home page where you get an at a glance indication of your systems security status.
Start a Quick scan from here or perform any advanced scans including Windows Defender Offline.
Fresh start is an option to download clean installation media for a fresh install of the latest Windows 10 Build.
Family Options still link out to the account.microsoft.com website but I fully expect these settings to be OS based soon - maybe in Redstone 3.
Windows Defender Hub
Expanded article on the Windows Defender Hub. The new Share icon can be used to share the article to any of your share targets.