Hello, egna. Normally, all your filed returns show up automatically in the Filings tab, provided the Status filter is set to All or other related options, and you've selected the correct tax agency at the top.
Since this is only happening in one of your companies, I recommend reaching out to our live support team. They can further investigate why that specific company file isn't displaying your returns properly.
The Community is always here if you have more questions about managing your taxes or anything else in QuickBooks.