How I can select the title of the Checkout Terms page ?

After creating special pages on your store such as terms of use or shipping information and delivery ...

For more information on how create web pages from inside store control panel please read the following article 

https://expandcart.zendesk.com/knowledge/articles/360007234193/en-us?brand_id=360000292593

You can set the page you want by going from the control panel to settings then the advanced settings then the orders and There is a tap called Checkout Terms..

You can choose what suits you

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