Word mail merge doesn't show label guidelines/outlines

Hi all.

In the past, when I choose to create label mail merge, the outlines of the individual labels would appear on the page (as a grid/table on the page), so that I can click into the first label to insert a picture and add text to create a template label.

Now, when I choose to create a label mail merge, the page is just blank and I can't see the outlines of the individual labels.

What can I do so that I can see the outlines of the labels?

Thanks in advance.