Editing Boolean Properties
Boolean check boxes differentiate between “applies” and “does not apply.”
To edit a boolean property:
Select an empty check box to set the property to “true.”
Deselect the check box to set the property value to “false.”
Click in the check box and press the Spacebar to toggle between “true” and “false.”
(default, auto-save enabled) Your changes are immediately saved. If auto-save is disabled, click the Save button to save your changes.