The undisplay command undoes display commands.
Undo a display expression command or all the display commands numbered n, ...
If n is set to zero (0), then undo all display commands.
where:
expression is a valid expression.
Undo a display expression, ... or display identifier, ... command.
Undo the display commands numbered n, ...
Undo all display commands.
where:
expression is a valid Java expression.
field-name is the name of a field in the class.
identifier is a local variable or parameter, including this, the current class instance variable (object-name.field-name), or a class (static) variable (class-name.field-name).