Save As Default: Any time that you change a setting or settings and click the Save As Default button your changes will be saved. Even if you exit out of EDS IV and get back in again, your default settings will be saved.
Width: This gives you the option of changing the width measurement for Single line center, Single line left, and Single line right.
Any time that you are in a property page, you can click "Apply" after making a change and it will immediately apply your change. The advantage of using "Apply" verses clicking "OK" after a change is that you can apply your changes and still move on to making other changes. Once you click on "OK", your changes will be applied and the property dialogues will close and you will be back at the View Window. You can also click "Cancel" and the property dialogues will close without implementing the last change.
For more information on digitizing Singleline Columns, click here.