This code goes in your functions file: http://pastebin.com/FntxMzGb
All you have to do is change “frog” on line 4 to match your custom post type name. *If you just want it for normal posts change “Frog” to “post”.
By default WordPress will not show anything in the array on line 5…so…if I wanted to hide my excerpt I would remove postexcerpt from the array.
That’s it!! 🙂
NOTE: This sets the default screen options, so if you have changed the options you may have to change the name of your custom post type or clean your database in order for the code to work.