app/overrides/add_favorite_products_per_page_configuration.rb
Deface::Override.new(
virtual_path: 'spree/admin/general_settings/edit',
name: 'add_favorite_products_per_page_configuration',
insert_before: "#preferences fieldset .form-actions",
text: %Q{
<div class="row">
<div class="col-md-6">
<div class="form-group" data-hook="admin_general_setting_favorite_products_per_page">
<%= label_tag :favorite_products_per_page, Spree.t(:favorite_products_per_page) %>
<%= text_field_tag :favorite_products_per_page, Spree::Config[:favorite_products_per_page], size: 3 %>
</div>
</div>
</div>
}
)