The EnableTypesetRule command turns on the specified typeset rule(s) in the Typesetting package for use in extended mode output, while the DisableTypesetRule command turns off the specified parse rule(s) in the Typesetting package for use in extended mode output.

Note that these options have no effect unless interface(typesetting) is set to extended.

There are too many rules to be able to list them all here, but all are available in the Rules area of the interactive Typesetting Assistant.

As a simple example, the rule  corresponds to the capability of typesetting the function  as a function  with subscript  as a function of .