diff --git a/book.json b/book.json
index 207085e..d173c9a 100644
--- a/book.json
+++ b/book.json
@@ -7,6 +7,13 @@
 	"structure": {
 		"readme": "preface.md"
 	},
+
+	"pluginsConfig": {
+		"theme-default": {
+			"showLevel": false
+		}
+	},
+
 	"plugins": [
 		"-search"
 	]