If you don’t want to display all the product reviews at the same time, you can set a maximum number through the “Number of reviews to display” option available in Voting/Review settings. If you don’t want to define a limit, set the value to “zero”.
In this case, to allow users to view more reviews you must activate the “load more” feature.
According to the settings, “load more” can be a link or a button. You can also change the text of the “load more” button or textual link.