Missing Simulator Devices in Xcode When programming with Xcode (8.3.3), the "View as" feature displays the   user interface on many simulated Apple devices. Yesterday, I could choose among the following devices.


AppleTV
iPad (5th generation)
iPad Air
iPad Air 2
iPad Pro (9.7 inch)
iPad Pro (10.5 inch)
iPad Pro (12.9 inch)
iPad Pro (12.9 inch) (2nd generation)
iPhone 5
iPhone 5s
iPhone 6
iPhone 6 Plus
iPhone 7
iPhone 7 Plus
iPhone SE


Today, these devices are still listed in the Scheme Editor next to the "Play and "Stop" buttons (build and run, stop icons), as shown below. 



However, today, I have only a subset of the devices to use with the "View as" feature, as listed and illustrated below.


iPad Pro (12.9 inch)
iPad Pro (10.5 inch)
iPad Pro (9.7 inch)
iPhone 7 Plus
iPhone 7
iPhone SE
iPhone 4s




I hope the question is not off topic, because it isn't really about programming but program usage. What have I done, and how can I fix it?
Bluntly put: "view as" ≠ simulator.

Those "view as" options are to preview different viewport resolutions with storyboards and are independent from simulator selection. As the resolutions are common with multiple devices (ie. iPhone 6 = 6s = 7) it is unnecessary to list them all. You could think of it as a visual preview.

The device list next to Play/Stop is the actual simulator selector list and choosing one will fire up an actual simulator when running.