I tried this, but unfortunately this is not possible for this questiontype. So I need to do this in a different way.
I tried by first making it as matrix and than by dragging increased length and one length is setup change it to slider.
Tried this. And in the build-modus this works. However when you preview the survey the width is displayed as default. And also when you use the anonymous link the display is as my screenshot. So there must be a different way to fix this.
@Nico_Leussink,
You can do it like this:
```
Qualtrics.SurveyEngine.addOnload(function() {
var lwidth = "225px"; //width of labels
jQuery("#"+this.questionId+" th.ylabel").attr('width', lwidth);
jQuery("#"+this.questionId+" .WidthStrut").css("width", lwidth);
});
```