When you delete a rule, the results depend on whether the rule is checked out to you. If a rule is checked out to you, the rule is deleted from your personal ruleset.
To delete a rule, open the rule that you want to delete, and click Delete or Discard:
If this rule is in an unlocked ruleset that does not require check out, clicking Delete deletes the rule.
If the rule is checked out, clicking Discard deletes the rule from your personal ruleset, but does not delete the checked in version of the rule.