If your farm is mapped in Decipher then labels will be displayed on the map for Farm, Paddock and Site, overlaying your paddock boundaries.
When you're zoomed out, only your farm name(s) will be displayed:
As you zoom into the farm the farm name will disappear and be replaced by the paddock names:
When viewing your sample results in the Samples tab you can switch site names on:
Read more about Farm Labels, paddocks and sites here: