There is a software solution for some cases to cover the left edge of the outer screen on the iPhone Duo. What Apple explains in its official case installation document Shift Left Edge setting moves the content away from this edge. This option, added to the iPhone Duo’s screen layout, aims to keep the text and interface elements under the case visible.
Apple states that when the back part of its iPhone Duo Case model is attached, a guidance appears on the inner screen. This message takes the user to Settings to adjust the external display to the case. Therefore, a connection is established between the installation of the physical accessory and the software option that regulates the usable area of the screen.
Besides, it is not necessary to turn on the setting only during the initial installation. Apple’s iPhone User Guide says the same option can be used manually for cases or bezels that partially cover the left edge of the external display. The decisive thing here is that the accessory actually covers the edge of the screen.
Therefore, it is not necessary to turn on the setting every time the case is worn. The same need may not arise with an accessory that does not cover the content. First checking to see if the items on the left side of the external screen are hidden makes it easier to understand what the feature changes.
Shift Left Edge option is located under Display and Brightness
For the process, go to the Settings application on the iPhone Duo. Then, the Display and Brightness section opens and the option named Shift Left Edge in the English document is activated. According to Apple’s statement, this process shifts the content on the external screen to make room for the front part of the case.
In MacRumors’ application transfer, it is stated that after confirmation, the screen darkens for a short time and the same settings screen is returned. A narrow black strip appears to the left of the external screen. This view shows the space below the sleeve edge to avoid leaving content behind. The physical installation of the case also requires special attention. Apple wants to make sure the phone is dust-free and placed on a clean, flat surface. On the front piece, the upper right and lower corners are aligned, and light and balanced pressure is applied to the other edges. On the back part, the upper edge closest to the camera is placed first.
To summarize, this setting is not a feature that increases the resolution of the screen or repairs a touch failure. It harmonizes the layout of the interface with the edge covered by the case. After installing the new accessory, it is enough to check where the content remains and use this option if necessary.