Hi Jen,
Thanks for reaching out to us.
Please make sure your theme has any gallery features or not. If your theme has a gallery feature, please disable the theme-built gallery and enable the WooCommerce default gallery.
If your theme didn’t provide a visual option to enable the default gallery, please contact theme support and ask them to do it for you.
Note: Our gallery plugin is an extension of the default WooCommerce gallery. It will not work with your theme-built gallery. Because there are several themes with different gallery structures. It is not possible to make it compatible with each. That’s why we extended the default WooCommerce Gallery.
Hope to hear from you soon!
Thank you
Fixing magnifier
Jen Chan