Only Profile owners & Admins Can See All The Wall Subnavs

yzc_remove_wall_subnavs.php

<?php

/**
 * Only Profile owners & Admins Can See All The Wall Subnavs.
 */
function yzc_remove_wall_subnavs() {

    if ( ! bp_is_active( 'activity' ) ||  bp_current_user_can( 'delete_users' ) || bp_is_my_profile() || ! bp_is_user_activity() ) {
        return;        
    }

    // Get Forbidden Subtab.
    $forbidden_subtabs = array( 'mentions', 'following', 'groups', 'favorites', 'friends' );

    foreach ( $forbidden_subtabs as $tab ) {
        bp_core_remove_subnav_item( bp_get_activity_slug(), $tab );
    }

}

add_action( 'bp_init', 'yzc_remove_wall_subnavs', 999 );