Combobox Dropdown Sizing

Hi, I have a swift MacOS application that has a Combobox dropdown (storyboard). I was wondering if it is possible to change the width of the item dropdown without changing the width of the actual combobox. Some of the items characters are chopped off at the end, but I don't want to expand the width of the actual combobox. If the items scrolled slowly when you hovered over them so users could read the chopped off characters, that would also solve the issue. Thanks so much for the help!

Combobox Dropdown Sizing
 
 
Q