app/overrides/admin_legacy_return_authorizations.rb
Deface::Override.new(
virtual_path: "spree/admin/shared/_order_submenu",
name: "admin_legacy_return_authorizations_submenu",
insert_bottom: "[data-hook='admin_order_tabs']",
text: %q(
<% if can? :index, Spree::LegacyReturnAuthorization %>
<% if @order.legacy_return_authorizations.exists? %>
<li<%== ' class="active"' if current == 'Legacy Return Authorizations' %>>
<%= link_to_with_icon 'share', Spree.t(:legacy_return_authorizations), admin_order_legacy_return_authorizations_url(@order) %>
</li>
<% end %>
<% end %>
)
)