The following may help. If you go back to a store it shows the steps to use. http://appleinsider.com/articles/17/10/31/how-to-enable-and-use-reachability-on- iphone-x
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Reachability is turned off by default. To turn it on, go to Settings > General > Accessibility, scroll down and tap Reachability, then turn it on.
Question: I’m considering buying an iPhone X but it appears reachability is not on it. i have tried in 3 stores without success. Can any one confirm if it is available on iPhone X please?