appsettings.json

{
  "ConnectionStrings": {
    "ConnectionString0": "Integrated Security=SSPI;Pooling=false;MultipleActiveResultSets=true;Data Source=(localdb)\\mssqllocaldb;Initial Catalog=DB0_EFCore",
    "ConnectionString1": "Integrated Security=SSPI;Pooling=false;MultipleActiveResultSets=true;Data Source=(localdb)\\mssqllocaldb;Initial Catalog=DB1_EFCore",
    "ConnectionString2": "Integrated Security=SSPI;Pooling=false;MultipleActiveResultSets=true;Data Source=(localdb)\\mssqllocaldb;Initial Catalog=DB2_EFCore",
    "EasyTestConnectionString": "Integrated Security=SSPI;Pooling=false;MultipleActiveResultSets=true;Data Source=(localdb)\\mssqllocaldb;Initial Catalog=DB0_EFCore_EasyTest"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information",
      "DevExpress.ExpressApp": "Information"
    }
  },
  "AllowedHosts": "*",
  "DevExpress": {
    "ExpressApp": {
      "Languages": "en-US;",
      "ShowLanguageSwitcher": false,
      "ThemeSwitcher": {
        "DefaultItemName": "Office White", // This line is changed according to the following BC: https://supportcenter.devexpress.com/internal/ticket/details/t1090666,
        "ShowSizeModeSwitcher": true,
        "Groups": [
          {
            "Caption": "DevExpress Themes",
            "Items": [
              {
                "Caption": "Blazing Berry",
                "Url": "_content/DevExpress.Blazor.Themes/blazing-berry.bs5.min.css",
                "Color": "#5c2d91"
              },
              {
                "Caption": "Blazing Dark",
                "Url": "_content/DevExpress.Blazor.Themes/blazing-dark.bs5.min.css",
                "Color": "#46444a"
              },
              {
                "Caption": "Office White",
                "Url": "_content/DevExpress.Blazor.Themes/office-white.bs5.min.css",
                "Color": "#fe7109"
              },
              {
                "Caption": "Purple",
                "Url": "_content/DevExpress.Blazor.Themes/purple.bs5.min.css",
                "Color": "#7989ff"
              }
            ]
          }
        ]
      }
    }
  }
}