Hello,
There’s a built-in option in the theme for this , But If your reviews are showing in product tabs, just do this:
1. Navigate to Theme Settings -> Single Product -> Tabs.
2. Set the Tabs Layout to Accordion.
This way, the review section will be collapsed by default, and customers can click to open it.
For the review settings, go to:
Theme Settings -> Single Product -> Review and configure as needed.
https://xtemos.com/docs-topic/product-reviews/
Best Regards