show hidden button or
selecting View->Show Hidden from the main menu when the
call tracer view is visible.
hide button or the
DELETE key. Hidden elements can be
threads,
packages,
classes and
methods.
You can select multiple elements from the list and press [OK] to
show these elements again in the call tracer view. Note that some elements can be subsets of others, so
unhiding an element might not make it visible. For example, if you have hidden the class
com.mycorp.MyClass and then the package com.mycorp, unhiding the class
com.mycorp.MyClass will not make it visible again, you also have to unhide
the package com.mycorp for that.