diff --git a/docs/data/tree-view/simple-tree-view/customization/GmailTreeView.tsx b/docs/data/tree-view/simple-tree-view/customization/GmailTreeView.tsx
index f1b70cafaa8a..2cc92fe196ab 100644
--- a/docs/data/tree-view/simple-tree-view/customization/GmailTreeView.tsx
+++ b/docs/data/tree-view/simple-tree-view/customization/GmailTreeView.tsx
@@ -162,7 +162,7 @@ export default function GmailTreeView() {
         endIcon: EndIcon,
       }}
       sx={{ flexGrow: 1, maxWidth: 400 }}
-      itemChildrenIndentation={16}
+      itemChildrenIndentation={24}
     >
       <CustomTreeItem itemId="1" label="All Mail" labelIcon={MailIcon} />
       <CustomTreeItem itemId="2" label="Trash" labelIcon={DeleteIcon} />