To select an operation, you simply select a face generated by the operation. The name of the corresponding operation is then added to the list.

Operations can be removed from the list by selecting them and using the "Del" keyboard touch.

To select several operations in the list and delete them at the same time:

"Ctrl + Left-click": each click on an operation in the list adds it to the selection.

"Alt + Right click": selects all operations between the one which has been clicked and the previous current in the list.