Add ViewSource (View MARC Record) icon instead of Document (placeholder) one when it will be ready.
It could be done via:
- Embedded view-source icon from <code>Icon</code> component;
- Custom icon using <code>Icon</code> component new feature (defined by https://issues.folio.org/browse/STCOM-542);
- Custom icon using <code>AppIcon</code> component (the less desired way due to its inconsistency).