In word2007, you can delete the horizontal line by looking at the endnote separator, but this command is not in the common command, so you should add it yourself, as follows.

Office button in the upper left corner of word2007 /word options/Customize/Select commands from the following locations Select all commands/Find "View Endnote Delimiter" in the list and add it to the customized quick access toolbar.

In this way, the horizontal line can be deleted when viewed as the main separator view.

You can refer to the following answers

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word2003

Switch to normal view and select View-Footnote from the menu. At this point, the edit bar of the footnote appears at the bottom of the document.

Select "Delimiter" from the drop-down menu in the footnote edit bar to delete the horizontal line that appears.

Then select Footnote Continuation Delimiter from the drop-down menu in the endnote editing bar to delete the horizontal line that appears.

Switch to print layout view.