• Number of posts per page:  Set how many posts per page you want to display.
• Number of Columns: Set The number of columns.
• URL Rewrite: The text displayed in the URL when you view a single project page. For example, set this to project for your URLs to look like site.com/project/project-name.
  

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

• Category URL Rewrite: The name displayed in the URL when you access the projects archive, such as an projects category. For example, set this to projects-category for your URLs to look like site.com/projects-category/category-name.

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

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