web/web_dashboard_open_action/static/src/xml/web_dashboard_open_action.xml

<templates>
    <t t-extend="DashBoard.action">
        <t t-jquery="span.oe_minimize" t-operation="after">
            <span class="oe_icon oe_web_dashboard_open_action fa fa-arrows-alt" />
        </t>
    </t>
</templates>