An electronic apparatus (1) includes a display generation unit (110) configured to generate a display area (210) in a user interface (200-4,200-5), the display area being configured to display a 3-D model of a patient's face and a 3-D model of a patient interface device fitted to the 3-D model of the patient's face； and a transparency adjustment unit (150) configured to generate a transparency adjustment tool (250) in the user interface, the transparency adjustment tool being operable to adjust the transparency of a subset of components of the 3-D model of the patient interface device displayed in the 3-D display area of the user interface.
