If a listing/member selects a top level category from their contact details form, it displays on the member profile below the name by default (highlighted section in the image below):

This element can be hidden by simply adding this CSS code to your websites Custom CSS/HEAD section:

span.profile-header-top-category {
    display: none;

This section can be found under SettingsĀ --> Design Settings --> Custom CSS/HEAD section:

This is how the profile looks after the code has been added: