First of all, see if there is any strikethrough, and delete it directly in the font dialog box.

Let's talk about how the automatic border comes from: type three minus signs (small horizontal lines) in a row in word-then press Enter, and word will automatically generate a border.

Delete method: select this line of the horizontal line to find the "start" column, then find the icon of "border" below, click and select the icon without border, and it's OK! ! By the way, it is still very useful to learn the automatic box when writing your resume! Remember (minus three-re-enter)