Design Widget not showing up

Hello,
can you capture the screen?

Can I have saved a screenshot. Can I not attach here. Sorry.

Ofcourse, as long as i can see the problem from your side.

I do not see where I can attach a screenshot. Apologies

you can use https://imgbb.com/ to attach your screenshot and send me the link.

https://ibb.co/m907iV

I am using Enfold Theme

I think that your theme does not allow our plugin to create customize. You can create a test site and change your theme on the test site to do a test.

I will ask for a refund? Is that appropriate?

If you are using premium version, please create a topic on https://villatheme.com/supports/forum/plugins/woocommerce-coupon-box/ with admin info, i will help you check the problem. If i can not solve your problem then you can make a refund request.