Size product not showing

Not applicable
906 0 58

Hi, I added sizes to a product but these are not showing on the product page. I I select the product in my shop it automatically chooses the first size/variant I created. I'm using the simolux theme.

I checked previous topics and edited the theme.js.liquid code but it still is not showing.

What to do? :) I'm new in HTML so please tell me where in the theme codes I would need to make any changes and what the code would be. Thank you