Hi Jaime,
Based on the provided information, we have prepared a sample that will select the image instead of the text from the DropDownList. The width and popup panel width can have different width size. It can be set by using the width and popupWidth property.
For online Demo, please refer to the below link
http://jsplayground.syncfusion.com/jezgok2k
For DropDownList’s API, please refer to the below link
http://help.syncfusion.com/js/api/ejdropdownlist#members
Could you please ensure the sample at your end and let us know if you have any other queries.
Regards
Kalai Selvi