diff --git a/docs/en/Tutorials/Part-8.md b/docs/en/Tutorials/Part-8.md
index 24dafffdb9..9d638e909e 100644
--- a/docs/en/Tutorials/Part-8.md
+++ b/docs/en/Tutorials/Part-8.md
@@ -102,7 +102,7 @@ namespace Acme.BookStore.Authors;
 
 public class GetAuthorListDto : PagedAndSortedResultRequestDto
 {
-    public string Filter { get; set; }
+    public string? Filter { get; set; }
 }
 ````
 
diff --git a/docs/en/UI/Angular/Theme-Configurations.md b/docs/en/UI/Angular/Theme-Configurations.md
index e663955667..09cbc5914c 100644
--- a/docs/en/UI/Angular/Theme-Configurations.md
+++ b/docs/en/UI/Angular/Theme-Configurations.md
@@ -69,7 +69,7 @@ Theme packages no longer import styles as CSS modules as of ABP version 6.0. The
 },
 ```
 
-## Lepton X
+## Lepton X [commercial](https://docs.abp.io/en/commercial)
 ```json
 {
     "input": "node_modules/@volosoft/ngx-lepton-x/assets/css/dark.css",
@@ -174,7 +174,7 @@ Theme packages no longer import styles as CSS modules as of ABP version 6.0. The
 
 ```
 
-## Theme Lepton
+## Theme Lepton [commercial](https://docs.abp.io/en/commercial)
 ```json
 {
     "input": "node_modules/@volo/abp.ng.theme.lepton/dist/global/styles/lepton1.min.css",
diff --git a/docs/en/docs-nav.json b/docs/en/docs-nav.json
index 4f33f30f51..ad2bbc652b 100644
--- a/docs/en/docs-nav.json
+++ b/docs/en/docs-nav.json
@@ -16,7 +16,7 @@
     },
     {
       "text": "Getting Started",
-      "path":"Getting-Started-Overall.md",
+      "path": "Getting-Started-Overall.md",
       "items": [
         {
           "text": "Web Application - Layered Architecture",
@@ -1166,6 +1166,10 @@
                       "text": "Overall",
                       "path": "UI/Angular/Theming.md"
                     },
+                    {
+                      "text": "Configuration",
+                      "path": "UI/Angular/Theme-Configurations.md"
+                    },
                     {
                       "text": "The Basic Theme",
                       "path": "UI/Angular/Basic-Theme.md"
@@ -1405,8 +1409,8 @@
           "path": "Modules/IdentityServer.md",
           "items": [
             {
-             "text": "IdentityServer Migration Guide",
-             "path": "Migration-Guides/IdentityServer4-Step-by-Step.md"
+              "text": "IdentityServer Migration Guide",
+              "path": "Migration-Guides/IdentityServer4-Step-by-Step.md"
             }
           ]
         },
@@ -1438,7 +1442,7 @@
         },
         {
           "text": "Common",
-          "items":[
+          "items": [
             {
               "text": "Database Tables",
               "path": "Modules/Database-Tables.md"
@@ -1515,4 +1519,4 @@
       "path": "Contribution/Index.md"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/docs/zh-Hans/Tutorials/Part-8.md b/docs/zh-Hans/Tutorials/Part-8.md
index d3b78de7e0..5c58d1b524 100644
--- a/docs/zh-Hans/Tutorials/Part-8.md
+++ b/docs/zh-Hans/Tutorials/Part-8.md
@@ -107,7 +107,7 @@ namespace Acme.BookStore.Authors
 {
     public class GetAuthorListDto : PagedAndSortedResultRequestDto
     {
-        public string Filter { get; set; }
+        public string? Filter { get; set; }
     }
 }
 ````