Server Manager displays information in the default system font, which is proportionally spaced. A 15 character computer name may be truncated, and the columns are not able to be resized.
To work around this problem, use regedt32 to navigate to:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\Current version\Network\Server manager
Double click FontFaceName in the right hand pane and change the string to a non-proportinally spaced font.
NOTE: This change is user based.