To delete an angle in iLevelX and Messflex, it needs to be selected.

You can select an angle in two ways:
(1) By tapping onto the small marker on the angle disc
(2) Swipe left to show the angle list and select the respective angle in the list.

To delete an angle there are two options:
(1) Tap the delete button
(2) Swipe left in the angle list table