We currently do not have a feature that lets you hide your CV from certain employers. We definitely understand the desire to hide your CV from certain employers though, and we are looking into a good solution.
If you would like to change the visibility of your CV, log into your account here.
To the right of your resume, you'll see options to make your CV public or private.
Public CVs are visible to anyone, however, your phone number and email address are provided only to employers to whom you apply. Your street address and postal code are visible only to you.
Private CVs are not visible (and employers cannot find you). When you set your CV to Private, it does not appear in the search results, but you will still be able to use it to apply for jobs with the Apply Now button.