Hello: You can find the selection pane in word and page layout to see if there are any useless objects such as graphics, pictures and text boxes. Delete it. If not, you can upload the sample file to Baidu pan.baidu.com's network disk and create a public link. Word has a good hiding format. Please refer to the documentation for a good analysis.

Hello: I tried to export a PDF with wps20 13 Personal Edition, but there was no such line.