Hi LEMON5
Oh, I understand now what you were talking about.
The problem here is that you have hidden the product type column and this is being used to expand the children rows (for variations, for example). So just re-enable that column and click on the icons there (in blue) to expand rows.
Also, you have an option in ATUM Settings >> Stock Central named "Expandable rows" that you can enable to show all the rows expanded by default.
Best Regards,
Salva.