New User can see all Projects and Tasks. How to show only Projects of his Department?

I need to do that User can’t see all Projects and Tasks.
By Default when I give User role Project User, User can see all Projects.
How to do that User can see nothing before than I give him permissions for access to Department?

You can go to ‘Role Permission Manager’ in ‘Users’ section.
Select the Role you want to implement this for and check the ‘If Creator’ checkbox for Tasks and Projects.
Now users will be able to see the Tasks and Projects they created or the ones shared with them.

Hope it helps