app/views/items/_set_governing_apo_ui.html.erb
<%= form_tag set_governing_apo_item_path(@cocina.externalIdentifier) do %>
<div class='mb-3'>
<%= label_tag :new_apo_id, 'New governing APO' %>
<%= select_tag :new_apo_id,
options_for_select(@apo_list, @cocina.administrative.hasAdminPolicy),
class: 'form-select' %>
</div>
<button class='btn btn-primary'>
Update
</button>
<% end %>