Use group name as tags.

src/Squidex/Areas/Api/Config/Swagger/SwaggerServices.cs

@@ -106,6 +106,7 @@ namespace Squidex.Areas.Api.Config.Swagger
             settings.GeneratorSettings.DocumentProcessors.Add(new RuleActionProcessor());
             settings.GeneratorSettings.DocumentProcessors.Add(new XmlTagProcessor());
 
+            settings.GeneratorSettings.OperationProcessors.Add(new TagByGroupNameProcessor());
             settings.GeneratorSettings.OperationProcessors.Add(new XmlResponseTypesProcessor());
 
             return settings;

src/Squidex/Areas/Api/Config/Swagger/TagByGroupNameProcessor.cs

@@ -0,0 +1,32 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Collections.Generic;
+using System.Reflection;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using NSwag.SwaggerGeneration.Processors;
+using NSwag.SwaggerGeneration.Processors.Contexts;
+using Squidex.Infrastructure.Tasks;
+
+namespace Squidex.Areas.Api.Config.Swagger
+{
+    public sealed class TagByGroupNameProcessor : IOperationProcessor
+    {
+        public Task<bool> ProcessAsync(OperationProcessorContext context)
+        {
+            var groupName = context.ControllerType.GetCustomAttribute<ApiExplorerSettingsAttribute>()?.GroupName;
+
+            if (!string.IsNullOrWhiteSpace(groupName))
+            {
+                context.OperationDescription.Operation.Tags = new List<string> { groupName };
+            }
+
+            return TaskHelper.True;
+        }
+    }
+}