How can I adjust the column width in the configurable list so the text isn't cut off?

I need "Access/Managed Markets," to fit in a single line, as well as and "Agency of Record (AOR)"

To achieve what you want this needs to be pasted in the widget: 

.col6 .checkbox{

    width: 190px !important;

}

To add the code click on the widget and then click on the wizard icon: 

Click on the CSS tab and then paste the code there: 

This should be the result: 

In case that the code does not take effect, it could be due to the class where the fields are in, to get the correct class you may also follow these steps. 

First right click on the column you want to  increase the width and click on inspect element: 

Then find the class of the <th> element that contains all the fields in the column: 

Replace that class in the code given above and it should work. 

Hope this helps.