iPhone Duo Interface: New Sidebar Reduces Usable Space on 5.4-Inch Cover Screen

Owners of the new iPhone Duo face a specific limitation on the device's smaller display. A mandatory sidebar occupies the right side of the 5.4-inch screen, reducing the available area for main content. This design choice creates empty space that users cannot currently access for apps or media.

The iPhone Duo features a 5.4-inch cover screen. Apple designed a sidebar to sit on the right edge of this display. The intent was to simplify navigation. In practice, the dock consumes a noticeable portion of the width. The result is a layout where a segment of the screen remains unused for primary content. This contrasts with the Galaxy Z Fold 8, where the outer display allows the main content to extend across the full width.

Allison Johnson of The Verge provided a second-impression review of the device. She noted that the iPhone Duo feels harder to use with one hand compared to the Samsung rival. The Galaxy Z Fold 8 has a taller and narrower physical profile. This shape makes the cover screen easier to reach and operate. Johnson also pointed out the spatial inefficiency caused by the iPhone Duo's sidebar.

A post on Twitter/X visually compared the two devices. The image highlighted the empty space on the iPhone Duo caused by the dock. When the Galaxy Z Fold 8 uses a navigation bar instead of gestures, the difference in usable space is less obvious. However, users who rely on gestures on the Samsung phone see very little wasted screen real estate. The iPhone Duo's fixed sidebar maintains a gap regardless of the navigation method.

Apple's approach aims to save space by shrinking the active area. This forces media to appear taller, similar to the layout on a standard smartphone. The Galaxy Z Fold 8 demonstrates that leaving the space open for main content works effectively. The iPhone Duo is currently available but stock is limited. The Galaxy Z Fold 8 continues to sell as a successful foldable option for Samsung.

The hardware for the iPhone Duo appears promising. The criticism focuses on the software implementation. This is Apple's first attempt at a wide foldable form factor. Users are comparing it directly to the refined Android experience on Samsung's devices. The sidebar remains a fixed element in the current iOS build. It reduces the practical utility of the 5.4-inch panel for one-handed tasks.