I am trying to run an iPad simulator on Xcode, but currently I only have one option when I go to Xcode > Open Developer Tool > Simulator, which launches the iPhone simulator. >
You should select an iPad device by navigating to
Hardware/Device/[OS version if you have multiple OS versions installed]/[device]
in the simulator's menu.
If there are no iPad devices in the list, follow these instructions:
Click on Hardware/Device/Manage Devices...
Select the Simulators option on the top.
Press the plus (+) sign in the lower-left corner.
Define the name, the device type and the OS version of the new simulator, then click on Create.
For more information, check out Getting started in Simulator.