Some iPhone Duo owners have discovered that Apple's first foldable is missing a pretty important appearance setting that you can adjust during the initial setup process, but not afterwards.Display Zoom setting on iPhone 18 Pro (left) vs. iPhone DuoWhen you first set up an iPhone Duo (or indeed any iPhone), an option screen called Appearance lets you choose how you would like text and icons to look on the screen. You can choose Default, Medium, or Large.Usually, you can adjust your initial choice at any time by going into Settings ➝ Appearance and tapping Display Zoom. On the iPhone Duo, however, that option is missing, so you're basically stuck with the setting you chose during setup.The omission was first noticed last week by a Reddit user. According to MacRumors forum member earthdog, an Apple Support senior advisor told them there is no way to change the appearance setting beyond initial setup and the only solution is to erase the device and set it up again.MacRumors can confirm that the option remains missing on the iPhone Duo running the latest iOS 27.2 software. We've reached out to Apple about the odd exclusion and will update this article if we hear back.Related Roundup: iPhone DuoBuyer's Guide: iPhone Duo (Buy Now)Related Forum: iPhoneThis article, "This iPhone Duo Screen Setting Is Proving Hard to Change" first appeared on MacRumors.comDiscuss this article in our forums