Hi,

Add a button with label Open in kanban view itself and in the button action open the record using the code like this,

Inherit the view like this:

<record id="view_partner_form_inherit" model="ir.ui.view">
    <field name="name">res.partner.inherit</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_partner_form"/>
    <field name="arch" type="xml">
        <xpath expr="//field[@name='child_ids']/kanban/templates//div[@class='oe_kanban_details']" position="after">
            <button name="action_open" string="Open" type="object">Open</button>
        </xpath>
    </field>
</record>

and inside the corresponding model:

def action_open(self):
for rec in self:
return {
"type": "ir.actions.act_window",
"res_model": "res.partner",
"views": [[False, "form"]],
"res_id": rec.id,
 }

Thanks