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Every time a user adds a new component to their assembly the component gets
placed into the assembly, then it's automatically hidden.
Solution
If a component or a set of components are set to "Show Only", this will force
only that component or the set of components to "Always" be shown. So with
"Show Only" being set, If the user adds a new component, it will also be
displayed Hidden when it's added to an asssembly.
To set the "Show Only" toggle. Select any of the components in the Assembly
Navigator and Right Mouse Button, select "Show Only", Or, Select a set of
components and Right Mouse Button, select "Show and Hide --> Show Only"..
To remove the "Show Only" toggle. Select the Main assembly and select "Show"
Notes and References
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: ASSEMBLIES
Version: V7.5.5
Function: ASSEMBLY_MODEL
Ref: 001-6912645