At this time, the "image setting" option cannot be hidden from the admin side of a portal. If you would like to change the image naming convention on your portal, then an admin user may update it at anytime as they wish.
After updates have been made upon the image naming convention, you will need to re-upload your product data file to refresh the updates in your portal.
Feel free to also reference this help article link for further set up steps:
You may also reach out to "firstname.lastname@example.org" for any additional assistance. Thank you!