Which colours control the highlight of the clock timer?


How do I control the two colours that appear on the clock timer?

The timer is the one that can be started like this:

Clock > Timer > START

There are supposed to be two colours on the ring that counts down on the timer.

There aren’t screens to directly control this in the editing tool. It’s obviously set from two other settings, but I can’t work out what they are.

Does anybody know?