User`s guide

Highlight Model Objects with Requirements
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Objects that do not have requirements are colored gray.
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To remove the highlighting from the model, select Analysis > Requirements
Traceability > Unhighlight Model. Alternatively, you can right-click anywhere in
the model, and select Remove Highlighting.
While a model is highlighted, you can still manage the model and its contents.
Highlight Model Objects with Requirements Using Model Explorer
If you are working in Model Explorer and want to see which model objects have
requirements, follow these steps: