- Define the starting point of the selection by clicking the 'Begin selection' button and define the end point by dragging the indicator to the desired position and clicking the same button.
- Choose as many selections as you want to delete.
- Undo selections: use the 'Undo selection' button to clear the selection.
Note: to undo all selections, place the indicator in the unselected area. To delete one selection, place the indicator within this selection.