Schemas are used to change how table viewlets are displayed in your dashboard. When a schema is applied it controls which columns are displayed in a viewlet, the order in which they are displayed and how the data is sorted. Please note, you cannot apply schemas to Global Repository dashboards, as these are sample repositories and cannot be edited.
Schemas are specific to each repository; when you create a new schema it will only be available in the repository you create it in. Each dashboard can have a different schema in effect.
To view all schemas available in the repository you currently have loaded, click on the main menu button located at the top right of your screen and select User Settings > Configure Schemas.
The Schemas window opens, displaying all schemas available to you.
From this screen you can add a new schema, update an existing one or remove schemas. To view a schema's item types and field configurations, simply click on the pencil icon for that schema. Applying schemas is done from a dashboard's tab.