In Architect, when you see models you should always see if they are locked, e.g. on the 'Find' results. When you see the model icon in Architect it uses a padlock symbol bottom right to indicate if it's locked but this isn't shown e.g. on the Find results. I know you can tell by checking the Properties and Information but a visual easy to see cue, consistent with how the model is shown in other contexts would be much better.
Visual cues are available in the web-based search.