To use the truth table utility, enter a sentence in the upper part of the window. With the cursor anywhere on that same line, click the "Create truth table" button. The truth table for that sentence will be displayed in the lower part of the window.
In the illustration, the truth table for the first sentence is displayed. The divider between the windows can be moved to show more of the table. If the selected sentence contains a syntax error, an error message is displayed.