There is more than one way of doing it by if you don't want to change any of the other projects you can:
1. Create a new users group called: external-users
2. Add the group to the Global Permissions Jira Access (so they can log in) and other permissions you might require.
3. On the Project, go to Roles and add external-users to the Group Role (Users)
4. Add users to the external-users group and remove them from all the rest.
As they don't belong to any other groups, they won't be able to see the other projects.
JIRA is designed with sharing in mind; therefore in its default configuration all new projects are shared and viewable by all other users. It ships with two major groupings of users: groups and roles. Groups are intended to global groups of users that can be assigned various permissions globally and per project. Project roles are similar, but are instead grouping on the project level. By default JIRA ships with groups and roles with matching names. When you create a new project in JIRA, it will automatically assign these user groups to the matching project roles. This gives these distinct groups of users the most common general default permissions for projects. For a complete overview of permissions and security in JIRA, check out the full Configuring Security documentation.
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