In ATracker version 15.0, we have introduced a new gesture to move/adjust/copy/delete task entries in the calendar view.
In the calendar view, touch and hold the task entry to select it.
Drag the task entry to move it. Or use the grab points to change the start/end time.
For users using iOS 16.0, you can copy/duplicate/delete the task entry.
For users using iOS 15 or earlier versions, you can copy/delete the task entry by using the buttons on the top of the task entry.