As a project administrator you can control who has access to your project (display tickets, etc.) as well restrict specified acciviti for particular team members. It is possible to grant permission to display and create tickets while not allowing to remove it.
There are two sections (see picture below) in project settings dedicated to manage project permissions and roles.
Below are saome basic information about where permissions and roles management is placed in project settings. For more detailed description, please refer to https://confluence.atlassian.com/adminjiraserver085/managing-project-permissions-981154936.html
Adding user to existing project role
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