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There are times when your Magento 2 store is out for the service or under maintenance. If the store owner wishes to shut down the store even for temporary period of time, it affects adversely to SEO of the store.
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Therefore, what you can simply do is to disable checkout in Magento 2 store.
Check the step-wise method to disable checkout in Magento 2
Log in to your admin panel.
Navigate to Stores> Settings >Configuration.
Open the Sales tab and click on the Checkout option.
Find the Checkout Options section, clear the Use system value checkbox in the Allow Guest Checkout field, and choose No from the dropdown.
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