The page Actions => Events page does not use the full width like Pages, Entry Pages and so o n in the Actions section.

To get the expected result we are force to create a new Dashboard, single column layout. Default display should use the maximum screen real estate.

Use case: We track Events with URL as the fourth argument :
_paq.push(['trackEvent', 'Sharing', 'Facebook', '/some/url/are/quite/long/sometimes/and/we/need/larger/display/']);

The thing with 10 000 pages websites is that lots of URLs start the same and only the end of URL is different. Mouseover is NOT a solution.