If you want to allow a user to only view selected applications without adding him to the hiring team, this is the place to see how that is done.
Each application has an Access section where you can view who has access to that particular job application.
There are a few ways to manage this:
Add a user from within the application
By clicking the button at the bottom, "Add user," you can now add individuals outside the hiring team to join only that application.
Add applications to a user from the Hiring team tab
You can add/remove application access from a user within the hiring team section for easy application management.
Add multiple applications to selected users from Bulk actions in the list view
You can select all the applications you want limited users to have access to from the list view and then bulk add them to the aforementioned users.