Not sure which manual you are reading, but this came straight from the manual that comes with 4.22.

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SETOPTION
Action SetOption can be used to configure certain options of the KiXtart script engine.

Syntax SETOPTION("option", "value")

Parameters
Option
Option to set.
Value
Value for the option.

The options and possible values are described in the following table:

ASCII ON, OFF
Default console output is in Unicode. Setting the ASCII option to ON changes the output to ASCII, so you can output extended characters, such as line characters.
CaseSensitivity ON, OFF
By default, all string comparisons are case-insensitive. Setting the CaseSensitivity option to ON configures KiXtart to make string comparisons case-sensitive.
DisableDebugging ON
Disables debugging (effectively disables the DEBUG ON command). Note that debugging can not be re-enabled.
Explicit ON, OFF
When you enable the Explicit option, you must explicitly declare all variables using the Dim, Global, or ReDim statements. If you attempt to use an undeclared variable name, an error occurs.Use the Explicit option to avoid incorrectly typing the name of an existing variable.
HideCursor ON,OFF
Hides or shows the console cursor.
NoVarsInStrings ON,OFF
Disables resolution of variables inside strings. In other words, if this option is enabled, any ‘$’ character in a string will be left as-is.
WrapAtEOL ON,OFF
Enables/disables wrapping of console output at the end of a line. Default is OFF.


Returns SetOption returns the previous state of the option.