Since it has been mentioned a couple of times, here is the existing feature request to make trainer mode switching easier on Mobile:
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ERG Mode On or Off Button Please, Mobile App (Feature Request)
Please add any related requests of mode swaps for mobile under that thread, since this topic is about an auto switch option (not manual).
And just to make sure it is covered, Win/Mac can be swapped easily with the ‘T’ key on a keyboard.