Nicolas LelloucheApple Inc.

iPhone Duo's hidden iOS 27 'Shift Left Edge' setting doubles left bezel to accommodate cases; pre-orders open October 16

Apple's iOS 27 introduces the 'Shift Left Edge' feature, which doubles the left bezel width to accommodate cases that partially cover the display. Pre-orders for the iPhone Duo will begin on October 16, with devices available starting October 23, 2023.

PCMag+1 source14 September 2026 · 15:40 UTC
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Apple's iOS 27 introduces a new feature called 'Shift Left Edge', designed to enhance user experience for those using cases that cover the left edge of the iPhone Duo's display. This setting, which can be found in the Display & Brightness menu, effectively doubles the width of the left bezel, providing a narrow black border that prevents content from being obscured by accessories.12457

The Shift Left Edge feature was highlighted by blogger Nicolas Lellouche during a hands-on session following Apple's recent iPhone event. The setting aims to ensure that the iOS back swipe gesture functions correctly, even when a case is in use. The iOS 27 description states, “Moves content when you are using a case that partially covers the left edge of the outer display of your iPhone.”

While Apple has released two official cases for the iPhone Duo, it remains uncertain whether these cases will cover the left edge of the display. It appears that the Shift Left Edge option is primarily intended to accommodate third-party cases, which often tend to be bulkier and may obscure the left side of the screen.

Pre-orders for the iPhone Duo will commence on October 16, with the devices expected to be available starting October 23, 2023. As reviews of the iPhone Duo emerge, more insights into the effectiveness of this feature will be revealed.6

Key Insight
“The setting, spotted by blogger Nicolas Lellouche during last week's iPhone event, is likely aimed at bulky third-party cases rather than Apple's official folio with kickstand. Apple's two official cases probably don't cover the left edge, so the feature addresses aftermarket protection.”
CuriousCats studied:
1
PCMag
“A new feature called Shift Left Edge was spotted in iOS 27 by ") Nicolas Lellouche during last week's iPhone event, and ") later reported on it.”
PCMag →
2
MacRumorsMacRumors
“Apple's new has a special option in its display settings that adds a narrow black border to the left side of the front screen.”
MacRumors →
Ask CuriousCats
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