Steps:

1. From your Shopify admin, go to Settings > Plan.

2. Click Pause or deactivate store.

3. If applicable, review the options to switch to the Pause and build plan, or start a new store.

4. If you still want to deactivate, then click Deactivate store.

5. Select a reason for the deactivation, and then click Continue.

6. Enter your password, and then click Deactivate now.