A toolbar appears above the dashed rectangle, allowing you to select the corresponding text block for editing. To do so, either click on the Edit button in the toolbar, or double-click anywhere inside the dashed border.
虚线矩形上面会出现一个工具栏，允许您选择相应的文本块进行编辑。点击工具栏中的编辑按钮，或者双击虚线边界内的任何地方即可编辑。