If your products have a lot of reviews (thanks to our plugin) and to display them all on a single page takes up too much space, WordPress has an option to limit the number of reviews and add a pagination link to the reviews tab.

This is a standard WordPress setting. You should go to Settings > Discussion from the Wordpress dashboard. Then, under Other comment settings check the box that says "Break comments into pages with [number]...". Whatever you set the [number] as is how many reviews will be shown on the review tab. The rest will get paginated.