Stash Quick Search (upper right) does not allow you to search on part of a project name (you must start with the same characters). There is no wildcard option.

Example:
If I am trying to find the project for my.project.component.planParticipant.test
I cannot input "planParticipant" in the search and get any results. Instead my search string has to start with the same characters as the full Item name I am looking for, so I would need to input "my.project.component.planParticipant" at a minimum to find my project.