How do I change the width of a listbox in a workflow form?

There doesn't seem to be a 'width' property for a Essentials Workflow Designer listbox form item (https://docs.geocortex.com/essentials/workflow/4.10/help/Default.htm#WPF_API/html/T_Geocortex_Forms_Client_Items_ListBoxFormItem.htm). Is there any way to change the width? In this case, it doesn't need to be responsive to content. just different than the default width.