diff --git a/src/model/post-cat.ts b/src/model/post-cat.ts
index 853667a6..dd4ae1b4 100644
--- a/src/model/post-cat.ts
+++ b/src/model/post-cat.ts
@@ -10,6 +10,7 @@ export class PostCat {
     childCount = 0
     visibleChildCount = 0
     parent?: PostCat | null
+    children?: PostCat | null
 
     flattenParents(includeSelf: boolean): PostCat[] {
         // eslint-disable-next-line @typescript-eslint/no-this-alias
diff --git a/src/service/post/post-cat.ts b/src/service/post/post-cat.ts
index 6c1b1918..0fb32245 100644
--- a/src/service/post/post-cat.ts
+++ b/src/service/post/post-cat.ts
@@ -28,6 +28,21 @@ export namespace PostCatService {
         }
     }
 
+    export async function getFlatAll() {
+        const categories = await getAll()
+
+        const flat = []
+        const queue = categories
+        while (queue.length > 0) {
+            const current = queue.pop()
+            flat.push(current)
+
+            if (current?.children != null) for (const child of current.children) queue.unshift(child)
+        }
+
+        return flat
+    }
+
     export async function getOne(categoryId: number) {
         const req = await getAuthedPostCatReq()
         try {
diff --git a/src/service/post/post-cfg-panel.ts b/src/service/post/post-cfg-panel.ts
index a2b0f38e..20329463 100644
--- a/src/service/post/post-cfg-panel.ts
+++ b/src/service/post/post-cfg-panel.ts
@@ -76,7 +76,7 @@ export namespace PostCfgPanel {
                     command: Webview.Cmd.Ui.editPostCfg,
                     post: cloneDeep(post),
                     activeTheme: vscode.window.activeColorTheme.kind,
-                    userCats: cloneDeep(await PostCatService.getAll()),
+                    userCats: cloneDeep(await PostCatService.getFlatAll()),
                     siteCats: cloneDeep(await PostCatService.getSitePresetList()),
                     tags,
                     breadcrumbs,