Add 'Customize current view' into View->Current View menu
OpenTasks sorts VTASKS and shows (as tab name) the applied sorting. It offers
- Sorting first by CalDAV collection source and then by name
- by DUE
- by DSTART
- by PRIORITY
- by progress, probably meaning by PERCENT-COMPLETE
Evolution -> Tasks view allows sorting, but only if somebody comes to the idea to click on "Summary" with the right mouse button.
- Write in the Summary line the applied sorting
- As the Summary line is long enough consider adding to it tabs/mutualy exclusive buttons for the sorting, so that users can see they can sort
- The "Sort by" context menu shall be shown not only when Summary is clicked, but also when anywhere is clicked in the panel.
Likewise for the To Do bar:
- Offer sorting, either as context menu or as tabs/mutually exclusive buttons, or both
- show in the title after "To Do" the applied sorting