Does iPhone X support Display Zoom?
No


  Not yet. It’s a whole new UI so my guess is that has to be redone at the second scale still. Dynamic text is there and improved, though. https://twitter.com/roelvangils/status/925696251651330050


https://twitter.com/reneritchie/status/925709868425793542

That makes sense to me because if a developer wants to support iPhone 6 sizes and larger then they already should have support for iPhone SE which is used when Display Zoom is turned on on an iPhone 6. There is no smaller version of the iPhone X with its notch and rounded corners, thus no Display Zoom. Next year we might have display zoom on iPhone X Plus.