Hello Hany,
In events and content filters, clicking on the individual condition or action will show a Delete button that allows you to remove that one item. You do not need to delete the entire event or filter to modify the conditions/actions. If you don't see a Delete button when you click on the individual condition or action, I would encourage you to contact our Support team for a technical review.
I hope this helps!
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com