If a model has two associated form views, We can use the Context of a field to tell Odoo which view to load. 

To find the XML ID of the view we want to load, we should first pull up view we'd like to load in a new tab. From here, click the "Edit view: Form" button from the debug menu. 

From this view, use the debug menu again and select "View metadata". Copy the XML ID.

Navigate back to the view with the many2one field. Open Odoo Studio. Click on the field, then set the context following the below syntax:

{'form_view_ref': 'view_XML_id'}

So our example will be:

{'form_view_ref': 'sale_renting.rental_order_primary_form_view'}