add

lib/pages/read_web/widgets/item.dart

@@ -145,7 +145,7 @@ class _BuildItemState extends State<BuildItem> {
                       ):const SizedBox(),
                     ],
                   ),
-                  Transform.rotate(
+                  chapterModel.children!.isEmpty?const SizedBox(): Transform.rotate(
                       angle: chapterModel.selected?0:-90 * (3.141592653589793 / 180),
                       child: GestureDetector(
                         onTap: (){