Viewlets have many options. Use the images and explanations below for a better understanding.
A: Collapse / Expand: Click to either minimize or expand a viewlet.
B: Viewlet name: The name of your viewlet.
C: jKQL query line: The query which generated the viewlet's data.
D: Tear Off: Opens the viewlet in a new larger window.
D: Edit Query: When clicked, the query line becomes an editable field (or you can simply click within the query line). Make your changes. Suggestions will appear as you type the updated query.
F: Undo Query: Click this button to undo the last update made to the query.
G: Redo Query: Repeat the change you have undone.
H: Refresh Viewlet: Refreshes the viewlet. This process will check for new data.
I: Viewlet Menu: Click the menu button 
to open the viewlet menu.
J: Chart Type: Update the viewlet’s chart type. When clicked, the selected chart type of the viewlet will appear in blue.
K: Date and Time: Sets the date and time range for a viewlet. This time range will only be effective for the current session; the next time you log in, the system's default date and time range will be used.