There is a check box in the device selection screen , below the search entry,
you can check to shown only devices with simulation models so that you are sure that all available devices have simulation models.
This may not be very helpful when you want a specific component but it will help when you need a NPN transistor for example
so that you can select one that you will able to simulate.
Don't forget to uncheck this when you want to add a component like a pin header because it will not be shown.
Alex