To help you track the recent setup changes that you and other admins make to your Salesforce org, we added new events to the Setup Audit Trail.
Where: This change applies to the Setup Audit Trail, available in Lightning Experience and Salesforce Classic in Contact Manager, Essentials, Group, Professional, Enterprise, Performance, Unlimited, Developer, and Database.com editions.
Why: Track changes to:
- Email Deliverability—Your access to send email in Salesforce, set through the Access level field on the Deliverability Setup page.
- Connected Apps—Your connected app’s PIN length and inactivity timeout, set in the Mobile Integration section of your connected app’s settings. Access these settings from the Manage Connected Apps Setup page.
- Notifications—Your notification delivery settings for custom notification types, set from the Custom Notifications Setup page, and for standard notification types, set from the Notification Delivery Settings Setup page. You can track changes to mobile, desktop, and connected app delivery settings.
How: To view the audit history, from Setup, in the Quick Find box, enter View Setup Audit Trail, and then select View Setup Audit Trail.
https://help.salesforce.com/s/articleView?id=release-notes.rn_security_other_changes.htm&release=224&type=5