What does it indicate when drawing views have bold gray corners in a draft environment?

When drawing views display bold gray corners in a draft environment, it signifies that a component has been changed outside of the assembly and requires updating. This visual cue is important as it alerts the designer to discrepancies between the drawing and the current state of the model or assembly.

When components undergo modifications, the associated drawing views may not automatically reflect these changes until they are updated, ensuring that the designer maintains accurate documentation. Recognizing bold gray corners helps streamline the workflow by prompting designers to refresh their drawings, thus ensuring that any alterations to the component are correctly represented in the drafting environment.

The other options depict different scenarios: applying a new design template may not necessarily affect view borders; editing a drawing view typically would not be denoted by bold gray corners; and locking a view for user modifications usually results in a different visual representation, commonly indicated by alternative symbols or changes in color.