Unable to delete allocation rules

I've been to the manage allocation rules page, and when i click a rule to delete, the only option I have is to edit it, not delete it. The delete button is on the main screen with the list of rules. Unable to select a rule to delete without "selecting" it and getting to the edit screen for that rule with no option to delete.

The help files say to look for a "..." - but can't see that on either screen.

Any assistance gratefully accepted.

Andrea