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Are you referring to wanting to use http://widgets.jotform.com/widget/multiple_selection style but with disabled multiple selections? Or?
Please confirm or correct me so that we can assist you better.
Yes, that's wright !
Thanks for confirming that for us.
Since this widget does not have those sort of settings to allow only one option unfortunately after trying this out in a few different ways to attempt to find a solution this doesn't seem to be possible.
You could try to modify it in the form's full source code but since the widget runs in an iframe it might not work so I cannot guarantee it.
What I'll do is send a request for this as a new option for the widget to disable it if needed for consideration by our developers and if it is added we'll inform you here.