Please find the following steps to opt-out or unsubscribe a customer from receiving store updates.

1. Go to the sidebar.

2. Locate and hover your pointer over the "Customers" option.

3. Click on the "All Customers" option that appears.
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4. In the "All Customers" section, you'll see a search option.

5. Search for the customer you need.

6. On the right side of the contact details, you'll find a toggle button.

7. Click on the toggle button to view additional details.

8. Within the details, you'll find options to enable or disable various channels.