Salesforce periodically releases updates that improve the performance, logic, security, and usability of Salesforce, but which can affect your existing customizations. Find these important updates in the Release Updates node in Setup.
The Release Updates page provides a list of updates that affect your org. Each update includes step-by-step actions for you to take. To ensure a smooth transition, many release updates have test runs available. Use the test run option to enable and disable an update as often as needed before the “Complete Steps By” date so that you can evaluate its impact on your org.
https://help.salesforce.com/s/articleView?id=release-notes.rn_ru.htm&release=228&type=5