Odoo List view: set column to be always visible

I'm working with Odoo 14 and would like to know if there is an option in XML template to suppress optional="show"/"hide" setting inherited from parent template. For example I have following code in parent template:

<field name="code" optional="show" readonly="1"/>

On a child template I would like to do something like this:

<xpath expr="//field[@name='code']" position="attributes">
    <attribute name="optional">Always on</attribute>
</xpath>

to set the code field to be always on, without option to hide or show the column. Is there any option to do so?



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