Is this the first time you used a trackpad with IPP? If so, just rest your three fingers on it and glide it across to switch apps. To go home just swipe up across the glass quickly with three fingers.
Thanks. I got the magic keyboard three months ago and actually thought it was faulty as I couldn’t do the three fingered gestures either. Why don’t they just include an instruction leaflet in the box. All ok now though thank you