This method applies not only to footnotes, but also to endnotes.
The operation steps are as follows:
Step 1: Click "View"-"Draft" to switch the document to draft view.
Step 2: Click "Reference"-"Show Remarks" . At this time, the footnote edit bar appears at the bottom.
Step 3: Select "Footnote Separator" in the drop-down menu of footnotes , then the dash appears, select it to edit or delete.
Step 4: Click "View"-"Page View" to switch back to normal view