Filemaker Engineers have hidden the label form beneath the scrolling list of forms. Why they can expand it to show all of them is...
Scroll down and select the label form and see if that works for you.
When you create a label layout as Jack describes, you can select from a number of "Avery" format numbers or design your own to fit a page of labels not found in the list.
You can also use a dedicated label printer like the "Dymo" brand with Filemaker to print labels one at a time if such is useful to you.