When the length of the items to be selected is short, the control does not display properly.
Note that this issue is a regression from a fix that was done to resolve another width related issue in the Claro theme → .
I believe that simply adding a min-width to the .form-element.chosen-container-multi css class would do the trick. Setting the min-width to 200px would make the control wide enough to show the entire default placeholder message.
Active
4.0
Code
Setting a min-width is probably not scalable because it only supports the default placeholder text. The overflow is caused by the min-width set for .chosen-choices, removing that should fix the overflow issue and it's up to users to set a min-width in their custom implementations.