The Ethereum Shapella upgrade enables the end-to-end unstaking flow, after which the validators with an exited status can withdraw their principals and rewards.
As a staking protocol, Lido has designed a 2-step withdrawal process to support native unstaking. It all starts on stake.lido.fi/withdrawals/request.
Request withdrawal: Lock your stETH/wstETH by issuing a withdrawal request. ETH is sourced to fulfil the request, and then locked stETH is burned, which marks the withdrawal request as claimable. Under normal circumstances, this can take anywhere between 1-5 days.
Claim: Claim your ETH after the withdrawal request has been processed.
Once claimed, you will have unstaked your stETH/wstETH and will now hold "regular" ETH. Please note that after unstaking, you will no longer be earning daily staking rewards on your ETH.