re: When I delete the ‘style=”width:0px;”‘, the drop-down menu displays adequately. Why is this div being manually edited and where can I can this?
This is not manually being set to 0. The Chosen library is a third party jQuery plugin to enhance the functionality of select drop downs. That width is calculated dynamically by the Chosen library based on the width of the real select drop down. Generally, if a 0 width is calculated it is because the real select (in this case the directory) is initially displayed inside a tab or toggle of some sort. Since the select is hidden initially the select will have a 0 width so the Chosen select will inherit that width.
How can this be fixed? Impossible to say without a link to the page with the issue. I can only give the the basic why of the issue might be present. If you share a link I’ll take a look and will hopefully provide you with a solution.