Sharing Project Progress with Clients
Go to Projects and, in the Share with client column, click Not Sharing next to a project. Enter your client's e-mail and save. Your client gets a letter with a link and a password to a read-only view of that project only: its work logs, screenshots and activity, nothing else.
Resend Invitation sends the letter again; Make Private stops the sharing at once.
What the client sees is described in Client Sharing: What Your Client Can See.