优化

app/src/main/res/layout/dialog_bookshelf_config.xml

@@ -58,13 +58,22 @@
         app:layout_constraintTop_toBottomOf="@+id/sw_show_last_update_time"
         tools:ignore="TouchTargetSizeCheck" />
 
+    <io.legado.app.lib.theme.view.ThemeSwitch
+        android:id="@+id/sw_show_bookshelf_fast_scroller"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:padding="6dp"
+        android:text="@string/show_bookshelf_fast_scroller"
+        app:layout_constraintTop_toBottomOf="@+id/sw_show_wait_up_books"
+        tools:ignore="TouchTargetSizeCheck" />
+
     <LinearLayout
         android:id="@+id/ll_layout"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:orientation="vertical"
         app:layout_constraintRight_toLeftOf="@+id/ll_sort"
-        app:layout_constraintTop_toBottomOf="@+id/sw_show_wait_up_books"
+        app:layout_constraintTop_toBottomOf="@+id/sw_show_bookshelf_fast_scroller"
         app:layout_constraintLeft_toLeftOf="parent">
 
         <io.legado.app.ui.widget.text.AccentTextView
@@ -119,7 +128,7 @@
         android:layout_height="wrap_content"
         android:orientation="vertical"
         app:layout_constraintLeft_toRightOf="@+id/ll_layout"
-        app:layout_constraintTop_toBottomOf="@id/sw_show_wait_up_books"
+        app:layout_constraintTop_toBottomOf="@id/sw_show_bookshelf_fast_scroller"
         app:layout_constraintRight_toRightOf="parent">
 
         <io.legado.app.ui.widget.text.AccentTextView

app/src/main/res/layout/fragment_books.xml

@@ -13,7 +13,6 @@
             android:id="@+id/rv_bookshelf"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:scrollbars="none"
             tools:listitem="@layout/item_bookshelf_list" />
 
     </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>