Recently I don’t know what Shopify changed again but “Show all” button in product metafields disapeared and we are no longer able to edit un-pinned metafields.
Same question on my side… is this a bug or a new feature?
It’s a bug. Confirmed with Shopify. If you need to access specific product metafields add /metafields at the end of URL. Solution until they fix the button issue
Seems to be fixed now.