🕛 Started/unfinished puzzles can be found in the Continue Solving block at the top of the My Puzzles page, in the Started folder at the top of the My Collection page (to open it, please tap on the Show More option under the My Collection block), or in the Downloaded category of the Feed, if a started puzzle is from the Feed.
The Started folder appears when you have at least one started puzzle and disappears when you have no started puzzles.