I must admit, it is the same on the Bagger. One needs to go to the Settings menu and then scroll to the heating menu and see what the setting is/was. There is not an on and off switch at hand.
To be honest, I seem to remember that I left them on and don’t bother changing anything as the temperatures in the UK are still on the low side. Once it gets warmer I will switch them off completely. In terms of settings, I find it that at level 2 I feel that warmth quite comfortably. 3 is a bit too much for my liking.