In the overview of calendars there is no option to change the order of the calendars, permanently listed or not.
Steps to reproduce:
- try to change the order of the calendars by clicking and dragging it upwards.
The calendar doesn't move. There also is no option like arrows to move it.
You can click on the calendar and move it to your desired spot between two other calendars. Or there is an option where you can set the order. It doesn't have to be by drag and drop.