Editing Boolean Properties
Boolean check boxes differentiate between “applies” and “does not apply.”
To edit a boolean property:
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Select an empty check box to set the property to “true.”
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Deselect the check box to set the property value to “false.”
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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.