Duo-tec, Platinum, original 600
Two grey knobs and a central display. The left knob is heating.
200, 400, 600 Combi 2, 800 Combi 2, Assure 500
Radiator knob on the left, tap knob on the right, four round buttons under the screen.
EcoBlue Advance
Screen in the middle with +/− buttons. No big grey knobs.
Heat only 400, 600, 800
Small radiator knob on the left, then two buttons. 400 Heat has this too.
Some later Baxi boilers look closer to Main Heating. If none of these match, look the model up on Boiler Manuals.
When the flow is set, go back to the Boiler Optimiser to log what it was and what you set.