I've found a solution for my problem.
To hide more, print and attachment buttons, i've create a view named base.xml in my_module/static/src folder, with the next code
<?xml version="1.0" encoding="utf-8"?>
<templates>
    <t t-extend="Sidebar">
		        <t t-jquery="div.oe_form_dropdown_section" t-operation="replace">
             <t t-if="widget.session.active_id === 516"> 				
				                <div class="oe_form_dropdown_section"></div>
			            </t>
			            <t t-if="widget.session.active_id !== 516">
                 ....... original base.xml div
             </t>
     </t>
</templates>
where 516 is the id of view i want to hide buttons.
I think there has to be a way to avoid to set an id value, but right now this is working fine.
Kind Regards.