When you hover on these variables there will be tooltip for whole name;

If you only want the column width to be extended temporarily, you can modify the webpage on browser like this:

Use Chrome (or Firefox similarly) to open the page and press F12;

Go to "Console" tab on the Developer Tools, enter the following (change 1600 to the width you want):

$("#editview .modal-dialog").width(1600);

Please note that this change will not be kept the next time you open this page.