Ebay just changed that a few months ago and it's a real PITA until you figure it out and remember how to get around it.
Look for the line of text with the aqua-colored background right above the listing's main photo, and click on the word "listing" that's in blue indicating that it's a link (red circle). That should take you to the Completed page of the listing you were originally looking for. That's the way to do it on a computer, I'm not sure if it's different on a phone app.
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