优化

app/src/main/res/menu/book_search.xml

@@ -3,6 +3,11 @@
     xmlns:tools="http://schemas.android.com/tools"
     tools:ignore="AlwaysShowAction">
 
+    <item
+        android:id="@+id/menu_search_scope"
+        android:title="@string/search_scope"
+        app:showAsAction="never" />
+
     <item
         android:id="@+id/menu_precision_search"
         android:checkable="true"