Limit photos count on specified page:

limit-home.php

<?php
//$photosModel = apply_filters( 'fv/public/pre_get_comp_items_list/model', $photosModel, $konurs_enabled, $AJAX_ACTION, $contest_id );

add_filter( 'fv/public/pre_get_comp_items_list/model', 'fv_filter_home_photos_count', 10, 4 );

function fv_filter_home_photos_count($photosModel, $konurs_enabled, $AJAX_ACTION, $contest_id) {
  if (!$AJAX_ACTION && is_front_page()) {
      // for change limit on other page replace "is_front_page()" to "is_page(22)" where "22" - page ID
      $photosModel->limit( 5 );
      $photosModel->offset( 0 );
  }
  return $photosModel;
}