Overlapping Objects
The Overlapping Objects tab lists objects that are either fully overlapping (the IP addresses are either the same or a complete subset) or partially overlapping (some subset of IP addresses are repeated, but not all).
For example, if a rule contains an object for 192.168.1.1 and another for 192.168.1.0/24, the 192.168.1.1 object is fully overlapped by the other object and is not needed in the rule. You can click the Remove All Fully Overlapped Objects from Rules button.
For partial overlaps, you need to evaluate each occurrence, determine if any changes can be made, and implement those changes directly by editing the objects.