BuddyPress.org

Add this snippet to your child-theme functions.php or bp-custom.php

function bpfr_hide_profile_edit( $retval ) {	
	// remove field from edit tab
	if(  bp_is_profile_edit() ) {		
		$retval['exclude_fields'] = '2'; // field ID's separated by comma
	}	
	// allow field on register page
	if ( bp_is_register_page() ) {
		$retval['include_fields'] = '2'; // field ID's separated by comma
		}		
	
	// hide the field on profile view tab
	if ( $data = bp_get_profile_field_data( 'field=2' ) ) : 
		$retval['exclude_fields'] = '2'; // field ID's separated by comma	
	endif;	
	
	return $retval;	
}
add_filter( 'bp_after_has_profile_parse_args', 'bpfr_hide_profile_edit' );