In a results filter, the dropdown list width equals the field width.
This leads to issues when there are many fields in a result table.
The table header styles are defined here:
They are actually vulkanized into nuxeo-app.html thus preventing any override.
One should be able to set the select width and the option width of a dropdown list.
EDIT Typically reproducible with nuxeo-document-content having all its columsn displayed on a small screen. Click one of the dropdown (i.e. creator, modified, etc.)