The Snooper includes an evaluation pane that allows convenient entry and recall of expressions and their values. Ordinarily the pane is not shown, to avoid taking up space.
To show the evaluation pane:
The evaluation pane actually is two panes. The upper pane is a table showing some expressions and their values; initially, it starts with just the global variables X, Y, Z, and S. The lower pane is a fairly conventional workspace, with a few minor differences. As you evaluate expressions in the workspace pane, they and their values will appear in the table pane.