In some CAD modeling packages, there is an automatic “tunnel vision” that occurs when you are active on a child component within a higher-level assembly. Below is an example of a CREO assembly, where a part file has been made active. Notice how the non-active files are ghosted out.
By default, CATIA does not have this option enabled, so when you activate on a component (in CATIA this is done with simply a double click), there is no visual change. To make this change, start by going into the CATIA internal option via Tools --> Options, then change the setting in the following location:
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