How to hide all objects of the same type 

Use

You can hide all objects that have the same object type as the selected objects.

Procedure

...

       1.      Select one object of each type that you want to hide.

       2.      Click on Show/Hide/Hide all objects of this type.

Result

Navigation mode is run and the Navigation Mode dialog box is displayed. The corresponding objects and their connections are hidden.

If you have run navigation mode, you can show and hide objects using the Navigation mode dialog box.