This is an extension of AU.L2-3.3.1 and arguably a part of ensuring that practice's effectiveness. The end result is your organization must periodically review your audit plan and ensure that the items you wish to log are still being logged, that new audit options are reviewed for applicability in your organization, or if options previously ignored should now be put into practice. Set up a schedule to do this on a regular basis, assign it to someone, and track its completion.
NIST SP 800-171 R2
The intent of this requirement is to periodically re-evaluate which logged events will continue to be included in the list of events to be logged. The event types that are logged by organizations may change over time. Reviewing and updating the set of logged event types periodically is necessary to ensure that the current set remains necessary and sufficient.