You can also do this via the global properties list if you are running execution mode.
SetOption ScriptAnimation, All
Set the ScriptAnimation to Off
Value: All (or true), Off (or false), or Calls
Description: The ScriptAnimation determines whether or not a script is animated (highlighted line-by-line in the Run window) as it runs, as follows:
• All or true. Each line of the script is highlighted as it is executed.
• Off (or false). The script is not animated.
• Calls. Each script or handler is highlighted, but not each line.
The ScriptTracing reverts to its default value upon completion of the script execution. (For more information, see Animation.)