How to change Labels of the dropdown

Hello, i need to change the name of the labels marked in red in the given image url.
In fact, i want to leave just a single word, like “Size” or “Category”, instead of “Product Size”. How to do that in the plugin? Which file do i have to change? Thanks.

• This topic was modified 3 years, 4 months ago by digiart1975.

The page I need help with: [log in to see the link]