Yes, you can withdraw at any time and any preferred amount. You can do so through:

1) Web App

Go to your name on the right top of your screen > click on "Withdraw/Transfer" > click the intended portfolio > adjust the slider according to your desired withdrawal amount and click "Continue" to proceed.

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2) Mobile App

Click the "Three horizontal lines" at the top left corner > select "Transfer funds" and choose "Take money out" > click the intended portfolio > enter the amount according to your desired withdrawal amount > select your bank account number and click "Continue" to proceed.​​