Under the top cover there’s a little flathead screw on the left, in what I assume is a thermostat.
Small adjustments until the pressure gauge drops. I purged the steam a few times and let it rise before adjusting again.
I must say it’s all very tidy under the hood!
There might be ways of doing it with the connected app thing but I haven’t bothered with that yet. More comfortable with mechanical things than I am with electrical ones, especially wireless!