You'll find a download button in the top right of the screen:
Upon clicking download, you will be presented with the option to choose a PDF or XLSX download. The brand will have chosen the template and other options for how the PDF will display.
When downloading a PDF of a Custom List, you will be able to choose the template and options for the PDF.
Note that options such as Inventory will only appear on the PDF if the brand has given you access to this data.