PW_Archives settings works just like WordPress menus. There can be multiple PW_Archives instances with their own unique settings. Each instance is identified by a name that can be referenced in widgets or shortcodes.
For example: let's say you want to list archives in your sidebar only showing the most recent year, and you also want archives listed on a dedicated archives page showing all years, all months, and all posts. Here's how you'd do it:
1) Just create two instances, name one "Sidebar" and the other something like "Full" and set the options for each. 2) Next, add the PW_Archives widget to your sidebar and select the "Sidebar" instance in the widget form. 3) Finally, create a new page, call it "Archives" and add the shortcode [PW_Archives name="Full"] in the content.
For complete documentation, visit philipwalton.com