• Custom Post Type Classes: Switch to Off to disable the Classes custom post type altogether and remove it from the main menu.
• URL Rewrite: The text displayed in the URL when you view a single class page.

After changing this field go to Settings → Permalinks → Save Changes.

• URL Rewrite name: The name displayed in the breadcrumbs when you view the single class page.
• Category URL Rewrite: The name displayed in the URL when you access the classes archive, such as a classes category.

After changing this field go to Settings → Permalinks → Save Changes.

Category URL Rewrite and URL Rewrite can’t share the same name.