The list of available simulators is dictated by three factors:
It will not show you the simulators whose iOS version reaches your current goal of application deployment. If you want to see some recent, previous iOS simulators, make sure the app deployment target is set accordingly.
If you go to "Settings" Xcode - "Components", you can confirm which iOS simulators are installed on your computer.
In the Xcode Devices window ( shift + command + 2 ), as shown in the snapshot in the original question, you can configure specific simulator devices for your Xcode environment.
source share