The Disambiguation window is used to find pages linking to a disambiguation page. You reach this window by clicking on the Disambiguation Analysis button of the main window. This window looks like this:
This window contains the following parts:
The title of the page you are analyzing.
The Tools menu is used to preview your modifications.
The Sort menu is used to apply a different sort order for the list of pages linking to this disambiguation page.
The button reloads the page from Wikipedia (your current modifications will be lost).
The [1] button opens the current page in your web browser.