I want to delete every review I imported

I imported some reviews to test the plugin would work properly but now I want to delete every review but I don’t see an option on my product page. How can I delete all the reviews without doing it manually?

Secondly, on my product page, the reviews are not showing the customer’s full name. I checked the plugin settings and ‘Hide name’ is unchecked so I’m not sure why the full names are not showing.

Thirdly, is there a way I can import reviews gradually without duplicates showing up. When I imported the reviews there were many duplicates on my review page and I’m not sure why. I would like to import maybe 20 at time so I can edit them properly and so on but I don’t want to see duplicates.

Lastly, the country filter for reviews is not working. I filtered for reviews only from Canada which were exactly 20 reviews but instead 631 reviews were imported from multiple countries. This is why I wanted to delete everything from scratch.