On the Products page, the Shopify → Etsy tab lets you filter your Shopify products by collection or by match status, but not both at the same time. Choosing one clears the other:
If you pick a collection, the Match filter goes back to All.
If you pick Matched or Unmatched, the collection filter is cleared and you see all your Shopify products again.
Why can't the collection and Match filters be combined?
The collection filter and the Match filter work from different sources, so Shuttle can't show both in one list. When you pick a collection, Shuttle shows that collection's products as they are in Shopify right now. The Matched and Unmatched filters work from the matches Shuttle has saved for your products.
Filter products by match status
Open Products in Shuttle.
Choose the Shopify → Etsy tab or the All Products tab.
Click the search icon at the top right of the product list to show the filters.
Open Match and choose Matched, Unmatched or Unmatched Variations.
In the Shopify → Etsy tab, leave the collection filter on All Collections when you filter by match status.