The default behavior, for security and stability purposes, is to show only the "least" advanced parameters, so, if you execute the stored procedure, it will show something like this:
|It doesn't show all the configuration options|
To display all of the available options, you have to run the "show advanced options" command:
CAUTION: Be extremely careful enabling this command, and remember to disable right after using it, because any user have access to the sp_configure command, and you will expose advanced configuration parameters to an untrusted user.
After this, you have to execute a RECONFIGURE command for the changes to take effect.
Note: RECONFIGURE and RECONFIGURE WITH OVERRIDE have the same effects for displaying the parameters, the only difference is when you change any parameter, the OVERRIDE option allows you to set a value outside allowed boundaries (yes, you should never do it, but the engine give us the option of shooting ourselves in the foot).
To show all the advanced options we proceed to run the following command:
|Note that not all options are displayed on the image|