When you look for security alerts that affect your Salesforce org, find them in the Release Updates node. Previously, security alerts resided in a separate location.
Where: This change applies to Lightning Experience and Salesforce Classic in all editions, except Database.com.
How: From Setup, in the Quick Find box, enter Release Updates. In the Release Updates page, you can find security alert cards. Security alerts functionality remains the same.
https://help.salesforce.com/s/articleView?id=release-notes.rn_sa_change.htm&release=228&type=5