seem to have lost 'trainer difficulty' setting

the trainer difficulty slider, seems to have gone from settings on my bkool classic, macbook air setup. didn’t notice the hills. And was the same resistance all the way through. any ideas?

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wow, what an iditot, controllable trainer was not selected on the pairing screen. somehow must have deselected it! oops

Seems you have to pair it for controllable trainer every time.