Hello @Tobias_Blaauw welcome to the Asana Community Forum 
Regarding sorting do you refer to task sorting within a project?
If so then you have various sorting options such as due date, assignee, alphabetical, etc
And the ones starting from “Country” are custom fields I added to this project so you can sort via those as well.
For more info on sorting you can also have a look here: Sort by Due Date - ascending or descending option - #36 by Andrea_Mayer
Does that help? Or is there anything else you would like to sort?