Product Image Sizing

I am trying to get the images on my woocommerce product pages to be 300 x 420. I am not using the right or left sidebars. I have adjusted the size in settings, installed and run Regenerate Thumbnails, and tried to adjust the size of the image I am uploading.

The size of the image on the products page is 540 x 540 no matter what I do. Has anyone else had this problem and if so, does anyone know how to solve it?

I spent all day yesterday searching online for a solution. I tried several things and nothing worked.

Any help is appreciated.

Thank you!