Techniques and arrangements for dynamically modifying a user interface on a computing device of a point-of-sale (POS) system based on a location of the computing device. The location can be associated with a functionality of the user interface. The user interface can include one or more icons corresponding to selectable items that correspond to the functionality. A modification to the user interface can include an adjustment to a visual appearance of an icon and/or a replacement of an icon with another icon.