Checkout Options
The checkout options control a number of attributes for the checkout page, including the layout. There are options you can configure to place constraints on checkout, including allowing guest checkout and enforcing a terms and conditions agreement. There are also options for controlling the display of information during the checkout process.
Checkout options configuration settings
Change the checkout options
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On the Admin sidebar, go to Stores > Settings > Configuration.
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On the left panel, expand Sales and choose Checkout.
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Expand
 the Checkout Options section. - 
    
If the settings are for a specific store view, choose the store view where the configuration applies.
When prompted, click OK to continue.
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Set the checkout options:
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Enable Onepage Checkout
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Allow Guest Checkout
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Display Billing Address On
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Enable Terms and Conditions
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Maximum Number of Items to Display in Order Summary
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Enable Address Search
If you set this option to
Yes, you can set the Number of Customer Addresses Limit option also.) 
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Click Save Config.