Hi,

You can call the do_action in your button function to display the form view; see an example below.

this.do_action({

            type: 'ir.actions.act_window',

            Name: sale order,

            res_model: sale.order',

    res_id: 1,

            view_type: 'form',

            view_mode: 'form',

            target: 'new',

        })

Hope it helps