How can I remove a customer's access to Shop?

There are two ways to remove access to a customer, fromFunctionalities > My STEL Shop > Users, click on the customer in question and uncheck the Allow accessbutton.

From the Customers, search for the customer and enter its tab > Shop tab, click on Edit within this tab and uncheck the Allow accessbutton.

When you do so, in the Users section of My STEL Shop, an X will be displayed in the Allow access column.