You can manipulate the signatures displayed using the Restricted Class panel of the Method Signatures dialog, shown in Method Signatures dialog. You can display this dialog by clicking Signatures in the generic function browser.
By default, the generic function browser displays the signatures of all methods defined on the generic function. When there are many methods, or when the distinction between different classes is not clear, this can be confusing.
To simplify the display, you can restrict the signatures to a chosen class and its superclasses. To do this, type the name of the class that you wish to restrict the signatures displayed to into text box in the Restricted Class panel. As with similar text boxes in Common LispWorks, click 
to confirm your choice, 
to cancel the current setting, and 
to display a list of possible completions.
Once you have made a choice, only those signatures that belong to the specified class or any of its superclasses are listed in the Signatures panel of the dialog. In situations where there are a large number of complicated signatures, this can simplify the display and add to your understanding of the methods defined.
Be aware of the difference between this approach and the use of the Argument box in the Signatures panel.
Click 
to display the signatures for all methods defined once again.