Comment 3 for bug 1610945

@Marco Graziotti, it is possible to change the color of a calendar in the list of all the calendars you use. Open the list by pressing a button looking like a small calendar in the top right corner of the screen. Then long-press the color box next to the calendar and you will see the color selection dialog.
The real drawback of this dialog is that the list of available colors is very limited. I can see only eight colors to choose from and no way to specify a custom color. Maybe this is what should be improved...
At the moment, I have version 0.5.858 (Jul 28, 2016).