Closed and canceled contracts stay on the Contracts page, one tab away.
Go to Contracts.
Click a tab at the top of the list:
Closed for deals that closed.
Canceled for deals that fell through.
Click a contract to open it.
To cancel a contract, click the three-dot menu (⋯) on its row and choose Cancel contract. See Edit or cancel a contract.
Who can do it: anyone on your team who can see the contract.