Open one item's history in four steps.
What an item page shows.
An item page splits What has changed from Everything else Actorly holds. A field that has never changed since Actorly started recording it says so, and gives the date recording started.
Deleted items are counted as "deleted, still kept". It does not recreate a deleted product. It keeps the deleted product's record and its last recorded values, so you can see what it was and, on Restore, export them.
When a page is empty.
While an import runs, a page says Actorly is still importing these and the list will grow. A kind Actorly does not watch yet says so, and that is not the same as your store having none.
Questions.
What is the difference between the Data room and Changes?
Changes is a timeline of every recorded change. The Data room is organised by item: what Actorly holds for each one, and its history.
Where do I export my history?
Export is part of the Data room, on Actorly Restore. See export your history.