Apple iPhone Duo sidebar consumes 15 percent of 5.4-inch screen

Apple has begun distributing the iPhone Duo to early adopters, and initial feedback suggests the software is limiting the device's most distinct feature. The phone features a 5.4-inch cover screen, a display size that is already compact. Reviewers note that the operating system imposes a structural restriction on this area that reduces the space available for user content.

The primary point of contention is a permanent sidebar that occupies the right side of the outer display. This dock is designed to streamline navigation, but it effectively removes a segment of the screen from active use. Allison Johnson, a reporter for The Verge, observed that this fixed element creates a large unused area on the right side of the interface.

The design choice stands in sharp contrast to the current standard for foldable devices. The Galaxy Z Fold 8, which serves as the primary competitor, allows users to utilize nearly the entire surface of its cover screen for media and applications. When users switch the Galaxy Z Fold 8 to gesture navigation, the screen remains largely unobstructed, providing a full-width view for content.

Johnson noted that the iPhone Duo feels more difficult to operate with a single hand compared to the Samsung device. The physical dimensions of the Galaxy Z Fold 8 are taller and narrower, which makes its cover screen more manageable for one-handed use. The iPhone Duo, while wide, requires a different physical approach to navigate the outer display effectively.

Apple's strategy for the iPhone Duo appears to prioritize a specific aspect ratio over total screen real estate. By shrinking the available width, the system stretches media to appear taller, mimicking the vertical orientation of traditional slab phones. This approach forces content into a narrower column, leaving the surrounding area occupied by the navigation dock.

The iPhone Duo is currently available to the public, though stock remains limited in many regions. Meanwhile, the Galaxy Z Fold 8 continues to see strong market performance. Early users are now testing the iPhone Duo in daily use, providing data on how the fixed sidebar impacts their workflow compared to the more flexible layouts found on rival hardware.

The device represents Apple's first entry into the wide foldable category. While the hardware specifications are competitive, the software implementation has drawn immediate attention for its conservative use of the outer display. The fixed dock remains a central feature of the current software build, with no indication of a toggle to hide it in the initial release.