Test Mode may be entered at any time during the design process, from either the Layout Menu or the Layout Bar. Test Mode temporarily disables all editing of the control surface, closes the Property Sheet and Control Library (if open), and allows the operational behavior of controls to be tested 'off-line'.
Ctrl+F9 may be used to toggle Full Screen while still in Test Mode. Entering Test Mode will also produce a prompt to save any changes that may have been made to the file. Please see the Keyboard Shortcuts section for more details.