A user that minted options previously can take action to leave the position at any time before expiration. To do so, the user must hold the options tokens amount in their wallet to unlock the unmint function. If the user sold those options previously they can buy them back on the AMM and leave the position.
Option tokens are burned during the unmint process. If the option is American and any exercise happened between the moment the mint and the unmint, the seller will receive the collateral that was previously locked in the contract during the minting process.