Configure View of a List that User sees only his data

Hi JFM_12 I'm not exactly sure what the condition would be to determine if an item belongs to a user in your case. However, you can try using the [Me] variable in the view to filter items by a person field.

The example view below will only show items where the user is listed as the Author or Editor of an item.

Of course, in this case, the user will still have access to other items, but those items will be hidden in this view.