xcode 11.4 has removed the standard "hardware" and device options from Simulator. How to open an existing device or create a new device?
Here is the new simulator menu:
In xcode 11.4, Windows > Devices and Simulators, there is no option to launch a simulator.
If you are running your app from Xcode, just select the device for the Active Scheme (top-left):
If not, then search for launch ios simulator from command line
Or, find this option: