WebSites/Identity.DefaultUI.WebSite/appsettings.json

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=aspnet-Identity.DefaultUI.WebSite-90455f3b-6c48-4aa0-a8d6-294d8e0b3d4d;Trusted_Connection=True;MultipleActiveResultSets=true"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  }
}