To downgrade your subscription to Free and cancel your paid subscription, click on the "Free" option and then click "Change plan" on your Subscriptions page here:

You can also access this page from the main navigation window at the top right:

On the Subscriptions page, click on the Free option:

Next, scroll down and click "Change plan":

Finally, accept the "Are you sure you want to switch plans?" prompt by clicking "OK":

That's it!

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