To unlink activities / key moment using the planning window (drag-and-drop):
- In the Items toolbar, click on the Unlink button on the right.
- Click on the target activity/key moment. You will see that the blue / black arrow disappears. The location of the activity/key moment will not change however.
- If you check the Details pane, you will see that the second option is selected and that the relative date has been changed into an exact date.