Hello @Smithy534,
Thank you for using our theme and for contacting us.
We would like to explain how to make the size guide appear on specific categories only. To do this, please navigate to XStore > Theme Options > Woocommerce (Shop) > Single Product Builder. Then, click on “Multiple Templates” and create new templates and assign the condition to apply the template to the particular category. For a better reference, please see the images provided: https://postimg.cc/XZ9VMD52 , https://postimg.cc/8sMLK1sW
We suggest that you edit the template and add the Sizing Guide widget to the section. Please ensure that all available settings for this widget are set according to your requirements. For reference, please see the image at the following link: https://postimg.cc/30Yjj6Xz.
We hope this will resolve your issue.
Best Regards,
8Theme’s Team