Customizable product button isnt showed

I am tesing, to buy, the free version of WOOCOMMERCE PRODUCT DESIGN 2.2 FREE.

I haven’t issues after the have installed the plug-in.
The theme is the last version of TRIZZY (with Woocommerce included)

I read the DOC, the product variations are showed, Customizable product is checked.
Seem all OK.

https://wordpress.org/plugins/woocommerce-products-designer/