There are two ways to “search” models in Astah.
When you want to search in the currently-opened diagram, hit [Ctrl+F] or [Command+F] to open the search field.
The search result appears in the list and in this pane you can do the followings:
– find in which diagram this model is used
– find where this model is in the structure tree
– replace name
For how to do so, check our this 1 minute tutorial clip! https://youtu.be/2EIyjUlOw94