If the option is off, a new process for formatting text lines with proportional line spacing will be applied. If the option is on, the previous method of formatting of text lines with proportional line spacing will be applied.
如果此选项关闭，将应用新过程以成比例的行距格式化文本行。如果此选项打开，将应用原先的方法以成比例的行距格式化文本行。