I upgraded HE to 184.108.40.206 and Thermostat Scheduler to 2.0.
In Select Period Settings I can click on the items in the Time, Cool, and Fan columns and change their values. When I click on anything in the Heat column, the screen flickers and a round circle of stars rotates to indicate something is happening, but then nothing happens and I am not offered any way to change Heating to a number, except for the Away item at the bottom where I can change all of Heat, Cool, and Fan. I can't change any of the regular Heating values to numbers.
Browsers: Firefox 104.0 and Opera 91.0.4516.20 under Linux Ubuntu 20.04.5 LTS.