Odoo - OpenERP - How to Switch between sale order line tree & sale order line windows in Sale Order?
It's the view : sale.order.form.editable.list which do it.
So you are in one of the group set for this view.
3 possibilities :
Remove yourself from groups using this view
Remove groups from this view
Disabled the view
To do it, you need to be 'technical user'.
Settings -> Technical -> User Interface -> Views -> search: "sale.order_form_editable_list"
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