Use this dialog when you want to set up various parameters for the name tags that can be printed on the Mark Attendance dialog. Here's what it looks like:
The parameters are self-explanatory. The one difference here from most dialogs like this in CMD is that you can click a button to use the parameters you set here only for the current session rather than saving them to the file that tracks these parameters. That way you can make a quick adjustment for a specific need without disturbing the normal settings you like to use for printing name tags.