You can access the Widget Designer sub-module by clicking Tools > Widget Designer from the LHS menu. Upon clicking this link, the Widget Designer page is displayed as depicted in the following figure:
The Widget Designer page displays the existing list with details such as Name, Description, Chart Type, Source Type, Active, and Ignore Owner Security.
You can click the 
button to view the additional fields such as Header, Source, Show Legend, Legend Position, Empty Chart Text, Combine Small Values, Label Display, Text Content, Created Date, and Modified Date.