Hi,

You can pass create = False inside the context.

See the sample,

context = dict(self.env.context or {})
context.update(create=False)
views = [
    (tree_view_id, 'tree'),
    (form_view_id, 'form'),
    (graph_view_id, 'graph')
]
return {
    'name': _('Product Margins'),
    'context': context,
    'view_type': 'form',
    "view_mode": 'tree,form,graph',
    'res_model': 'product.product',
    'type': 'ir.actions.act_window',
    'views': views,
    'view_id': False,
    'search_view_id': search_view_id,
}

Thanks