Currently on my site when I visit a top level category from the sidebar the URL is: http://example.com/top-level-category
Then when I click a sub-category in the resulting sidebar the URL is: http://example.com/top-level-category?cat=123
.
I would expect the URL to be the URL of the sub-category, i.e.: http://example.com/top-level-category/sub-category
Is there a way to get the category sidebar to use the SEO friendly-url instead of cat=123
for subcategories?