account-financial-reporting/account_financial_report/static/src/xml/report.xml

<template>
    <!-- Buttons of the Control Panel -->
    <t t-name="account_financial_report.client_action.ControlButtons">
        <div class="o_report_buttons">
            <button
                type="button"
                class="btn btn-primary o_report_print"
                title="Print"
            >Print</button>
            <button
                type="button"
                class="btn btn-secondary o_report_export"
                title="Export"
            >Export</button>
        </div>
    </t>
</template>