In a default installation of Zen Cart, the Reviews sidebox is set to display one review.  This means that the random feature of the sidebox is not evident. 

However, Zen Cart Admin provides an easy way to set the number of product reviews to include in a ‘selection pool’.  The reviews are then displayed randomly, one at a time, in the Reviews sidebox.

The wording of the description for the configuration setting is a little confusing to say the least!

Log in to your Zen Cart store Admin

1. From the Configuration menu, select Maximum Values.
   
2. Select Random Product Reviews for SideBox and then click the Edit button.
   
3. As mentioned, the information given is not quite correct.  This setting is to enter a number of product reviews from which ONE will be randomly selected for display in the Reviews Sidebox.

   Enter a number higher than 1 in the box and click the Update button to save.
   

4. Now, on each page load or refresh, a different product review will be displayed.

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