I am looking for blank templets for return labels.
Hi. In the menu click File > New > Labels, in the window that opens In the Labels tab in the bottom right there is a drop-down box labelled Brand, choose your brand of label there, respecting A4 or other designations. Under Type choose your label number. As you want return labels tick the box labelled Address and it will take the name and address from the data entered in Tools > Options > LibreOffice > User Data
If you don’t have any of the labels listed you can set your own layout in the Format tab