app/views/catalog/_exhibits_document_header_default.html.erb
<div class='row'>
<div class='col-3 col-md-2'>
<%= render_document_partial(document, 'thumbnail', document_counter: document_counter) %>
</div>
<div class='col-7 col-md-9'>
<%= render_document_partial(document, 'index_header', document_counter: document_counter) %>
</div>
<div class='col-2 col-md-1'>
<% exhibit_specific_manifest = document.exhibit_specific_manifest(current_exhibit&.required_viewer&.custom_manifest_pattern) %>
<%= iiif_drag_n_drop(exhibit_specific_manifest, width: '30') if exhibit_specific_manifest %>
</div>
</div>