You can request a partial withdrawal and do not have to withdraw all of your profits at once.
However, if you are on Pay After You Pass or the 1-Step Challenge, both programs have a Payout Lock rule. Once you request a payout, the Max Loss locks permanently to your account's original starting balance. Withdrawing your entire profit balance would bring your equity back to the starting balance which equals the locked floor, causing an immediate breach.
Example: $10,000 account grows to $11,500. Never withdraw the full $1,500. Withdraw $1,000 and leave $500 as a buffer. Equity stays at $10,500, safely above the floor.
The Payout Lock does not apply to 2-Step Lite or 2-Step Pro. For full details on the Payout Lock, refer to the individual program guides.