Sort Appointments in column not working

In the service providers backend, I inserted a table of their schedule.

[app_my_appointments provider="1" status="confirmed,completed,removed"]

That part is working but I am not able to sort the columns in any way.

1. How can I set it up so that when the page loads the columns are auto sorted by newest to oldest or visa versa.

2. When I click on the headings, the data is sorted.