By default, the platform does not have this option. You can use the following function code.

Please follow the steps below:

1. Go to Appearance > Theme Editor.

2. Under Select theme to edit, choose (BuddyBoss Child/whatever theme is active), then click Select.

3. Below Theme Files, select Theme Functions (functions.php).

4. Append the code just before the closing PHP tag “?>”:

add_filter( 'bp_nouveau_get_members_filters', 'bb_remove_atoz_memebers_sort', 10, 2 );
function bb_remove_atoz_memebers_sort( $filters, $context ){
  unset( $filters['alphabetical'] );
  return $filters;
}

5. Click Update File to save the changes.

Note: Any modifications are considered as custom work already. Know more about our Support Policy here: https://www.buddyboss.com/support-policy/