Do not force a global feature class inherits from the GlobalFeature class.

framework/src/Volo.Abp.GlobalFeatures/Volo/Abp/GlobalFeatures/GlobalFeatureDictionary.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 
 namespace Volo.Abp.GlobalFeatures
 {

framework/src/Volo.Abp.GlobalFeatures/Volo/Abp/GlobalFeatures/GlobalFeatureManager.cs

@@ -1,5 +1,5 @@
 using System;
- using System.Collections.Generic;
+using System.Collections.Generic;
 using JetBrains.Annotations;
 
 namespace Volo.Abp.GlobalFeatures
@@ -26,7 +26,6 @@ namespace Volo.Abp.GlobalFeatures
         }
 
         public virtual bool IsEnabled<TFeature>()
-            where TFeature : GlobalFeature
         {
             return IsEnabled(GlobalFeatureNameAttribute.GetName<TFeature>());
         }

framework/src/Volo.Abp.GlobalFeatures/Volo/Abp/GlobalFeatures/GlobalFeatureNameAttribute.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Reflection;
 using JetBrains.Annotations;
@@ -17,7 +17,6 @@ namespace Volo.Abp.GlobalFeatures
         }
 
         public static string GetName<TFeature>()
-            where TFeature : GlobalFeature
         {
             return GetName(typeof(TFeature));
         }

framework/src/Volo.Abp.GlobalFeatures/Volo/Abp/GlobalFeatures/GlobalModuleFeatures.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Collections.Immutable;
 using JetBrains.Annotations;