You get one label per record in your current found set. I believe you have only three records in your found set. You'll need to either include more records in your current found set or change the design of your layout.
If you decide to change the design of your layout, you'd use a blank page layout (rather than labels) so that you can place multiple copies of your return address on the blank page. This would take some careful work to get everything positioned, spaced and aligned correctly, but it would work and then you can print a page of return address labels with the Current Record option to get just one complete page printed.