One situation: preview sometimes can't see the extra grid, because there is nothing you input, but the grid and lines are beyond the margin, so I don't care. There's actually another page. When previewing, there are two options in the upper left corner: Previous Page and Next Page. Usually, you can click these two options in the preview. Otherwise, your preview will be printed or saved. The other is that you use a different computer to open it, because different versions of the software you use will also lead to this situation, so you have to readjust it.