Hello Marcin,

Please add code in the <tree> tag for the Sale order:-

<tree string="Sales Orders" fonts="bold:message_unread==True" colors="grey:state=='cancel';blue:state in ('waiting_date','manual');red:state in ('invoice_except','shipping_except')">

Please add code in the <tree> tag for the Quatation:-

<tree string="Quotation" fonts="bold:message_unread==True" colors="grey:state=='cancel';blue:state in ('waiting_date','manual');red:state in ('invoice_except','shipping_except')"> 

Hope this will works.

Thanks,

Please see the below sample code to make tree view with different color for different state of sale order.

<?xml version="1.0"?>

<tree string="Sales Orders" decoration-bf="message_needaction==True" decoration-muted="state=='cancel'" colors="grey:state=='cancel';blue:state in ('draft','sent','sale')">

<field name="message_needaction" invisible="1"/>

<field name="name" string="Order Number"/>

<field name="date_order"/>

<field name="partner_id"/>

<field name="user_id"/>

<field name="amount_total" sum="Total Tax Included" widget="monetary"/>

<field name="invoice_status"/>

<field name="state" invisible="1"/>

</tree>