Annotations in drawings are suppressed when the associated component is suppressed or invisible.
Components may be made invisible in the assembly (in a design view) or in the drawing.
Some guidelines to help you understand why an annotation is no longer visible in a drawing:
If a dimension is attached to multiple features or edges, the dimension is suppressed if any of its target features or components are suppressed or made invisible.
If a feature is suppressed or a component is made invisible, the attached annotation does not appear.
For example, a center mark attached to a hole center becomes suppressed when the hole feature is suppressed. Any dimension attached to the center mark is also suppressed.
Some leaders also have secondary leaders that reference other features or components than the primary leader. If only a primary leader is present and attached to a suppressed feature or invisible component, it is suppressed.
If multiple leaders exist, and the primary leader is attached to a suppressed feature or invisible component, it is not suppressed.