The option to remove the “categories” slug makes it easier and quicker for robots to locate and index your page.

For example, a URL with the slug looks like this: example.com/categories/painting 

A URL with the removed slug will look like this: example.com/painting/

If the SEO By 10Web plugin is not installed in your WP dashboard, go to the 10Web Dashboard and enable the SEO service. In your WP dashboard, go to SEO by 10Web and click on Settings. Under the General tab, in the Defaults box, find the Remove Categories Prefix. Set it to No to keep the prefix and to Yes to remove the prefix. Click Save.