If you wish to 1) instant unstake your SOL that is staked with a validator, or 2) wish to use the classic unstake.it UI, you can access Sanctum’s Instant Unstake via is available via unstake.it or here.
Step 1: Go to unstake.it.
Step 2: Connect Your Wallet
Step 3: Select your Stake Account
Step 4: Click ‘Unstake It’
Step 5: Receive SOL
When you select a stake account and click the 'Unstake it' button, the Sanctum Unstake Program transfers the selected stake account from you from the Sanctum Reserve Pool and transfers the same amount of SOL, minus the displayed fee, from Sanctum to you in return.
Sanctum then unstakes your stake account to replenish the pool.