Restrict times
This setting allows you to define a time window within which participants are allowed to make a choice.
To set an open-ended close date just set the time very far in the future.
If you don't need this at all then uncheck the box.
Discaimer: This project has been funded with support from the European Commission. The presentation reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.