A processing apparatus includes a function-screen processing unit and a customization-screen processing unit. The function-screen processing unit arranges setting-item elements in order, the setting-item elements corresponding to respective setting items to be displayed, the setting items being a portion of a group of setting items corresponding to a function provided to a user, and performs processing for presenting, to the user, a function screen on which a customization element for receiving a request for a customization operation is arranged after the arranged group of setting-item elements. The customization-screen processing unit performs, in a case where the user has performed an operation to request the customization operation on the customization element, processing for presenting, to the user, a customization screen through which, for each setting item in the group of setting items, specification of whether the setting item is to be displayed is received.