Signatures to Exclude from All Detections setting doesn't work

Trying to follow the following procedure:

Antivirus Settings > Scan and Risks > Exclusions / Low Risks > Signatures to Exclude from All Detections > 'Add' > Dropdown box - 'Insight Network Threat' >

To exclude the unuseful detection of WS.Reputation.1

But it doesn't work. It's incredible how this risk is taking into account from Norton (I have some answers about this....), but I'm really tired from false alarms and from the impossibility to have a control "before" and not "after", with a long and stupid recovery procedure.

If I won't find a solution I'll move to another product (after many years of Norton use)