To cancel Kindle Unlimited, go to Amazon > Accounts & Lists > Memberships & Subscriptions, select Kindle Unlimited, click Manage Membership, then choose Cancel Kindle Unlimited and confirm your cancellation.
To cancel Kindle Unlimited, log in to your Amazon account. Go to “Account & Lists,” then select “Memberships & Subscriptions.” Click on “Kindle Unlimited Settings.” Choose “Cancel Kindle Unlimited Membership” and follow the prompts to confirm. Your subscription will remain active until the end of the billing cycle, and no further charges will apply.