Dear Siglent, no need to press ON before fully setting with track and then change to independent.
Some Instek models do that also i.e. displaying same current in series mode on both channels ref CH1. Which is clearly wrong when the loading between common node and halves can very well be unequal. Must be addressed. That, and 1V coarse step too, so the Siglent PSU models will be complete for function and measurement. On all other fronts they are very good products indeed, I am happy with mine.