Activate Auditing lets you activate additional SharePoint auditing events to improve the results of your Audit Report.
Target the item(s) you would like to activate auditing events on from your Explorer tree.
Select Activate Auditing from the Quick Actions menu in the right pane, under Reporting.
You will now see the Activate Auditing page.
This table displays the targets of the auditing events. Please use this information to confirm that you are activating the events in the right location.
Select the events you would like to start auditing for the target.
Note: Opening or downloading documents, viewing items in lists or viewing item properties cannot be tracked by SharePoint 2016 and Office 365.
Click Activate Now.
You will now see your results page (any warnings or errors, if applicable, will appear on a separate tab).