When editing a break event (access-related) you have set, first open the Events panel by selecting [View] menu >> [Event]. After selecting the break event (access-related) you wish to edit on the Events panel, click [Edit Condition...] on the context menu. This will open a dialog box in which you can edit the selected break event. For details on editing in the dialog box, see "2.17.4.2 Editing access-related events".