You can control which parameters are displayed for a command during prompting by using prompt control specifications.
This control can simplify prompting for a command by displaying only the parameters that you want to see.
You can specify that a parameter be displayed depending on the value specified for other parameters. This specification is useful when a parameter has meaning only when another parameter (called a controlling parameter) has a certain value.
You can also specify that a parameter be selected for prompting only if additional parameters are requested by pressing a function key during prompting. This specification can be used for parameters that are seldom specified by the user, either because the default is normally used or because they control seldom-used functions.
If you want to show all parameters for a command that has prompt control specified, you can request that all parameters be displayed by pressing F9 during prompting.