On the product category pages, there is categories widget on the left sidebar.
It shows only the main categories (with number of products) but it does not show sub categories with a dropdown like in nav menu.
Is it possible to show sub categories under main categories on this sidebar widget ?
When click on main category it could be opening like dropdown and show sub categories.
This customization is not available at the moment, need to add js code to display dropdown with categories containing subcategories.
I can do this customization for you, but you will have to pay for this request