Following the update of joomla to the latest version 3.9.1, the solution proposed on the forum (https://www.youjoomla.com/joomla_sup...6262#edit67530
), in order to show the "checkbox" field, works in part. The modal window does not appear as it should. With the "protostar" template this is not a problem. Thank you
Are you sure your are posting in product assigned forum?
What is your CMS version?
: Joomla 3.x
Link to installation
Have you edited any files? If yes tell us which ones.
Is this personal or client website?