How do I add or remove columns?

To add, edit or remove a column you have to go to column settings which are located within a product section on a Product Menu. 

Select a menu from your dashboard. On the Product Menu Page, scroll down to Section. Click the 'edit' button beside a specific section. Click the 'column options' button to adjust column settings.

Column settings give you the ability to decide which information will be shown for a product, including data like size and strain type.

You can watch a video on column settings here, and read a more in-depth article about them here.