How do you reverse a contractors failed attempt at flagstones?

A contractor said he knew what he was doing when laying flagstones, with cement. It is not right, and now I am trying To think of a creative way to hide the mess without having to take it all out. It is a landing area off the backdoor of the house. Now it has some areas that are cracked, the edging is not finished off, and I was wondering if there was a sealer or a product I could use to keep it together or prevent more cracking?

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