To close a Portfolio you will need to sell all your holdings so that you no longer have money in a Portfolio.
To sell your Portfolio holdings:
Log into the Douugh app (or tap the ‘Home’ button if you are already logged in).
Tap on 'Invest Jar'.
Tap on your selected Portfolio.
Tap ‘Transfer Money’.
Tap ‘Out from Portfolio’.
Tap on ‘Sell All’.
Tap ‘Confirm’ and ‘Submit’.
After 2-3 business days, the money will be in your US wallet, ready for you to then withdraw.
If you have Autopilot set up you might want to stop if from funding your Portfolio and if you want to do this check out this guide: