Custom Field Data is the table wherein all the captured information from Custom Fields 1, 2, and 3 are shown. This is how you can see this through your Access Logs:
1. From your Locations tab, click on the desired location to edit.
2. Head over to the Access Log tab and click on this icon:
3. A drop-down list will pop up, scroll all the way down and you'll see the Custom Field boxes
Note that this cannot be saved and should always be ticked in order to be shown