<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <report
            id="quote_so"
            string="Quote/so"
            model="sale.order"
            report_type="qweb-html"
            file="test_report.quoteso_report"
            name="test_report.quoteso_report"

     />
  
    <template id="quote_documentss">
   
        <t t-call="web.external_layout">
   
        <div class="page">

            <div align="right">
                <p align="right" padding-left="50px">
                    <b>
                        <h3><span t-field="doc.state"/>:
                            <span t-field="doc.name"/>
                        </h3>
                    </b>
                </p>
            </div>
           


        </div>
        </t>
        <!--<p style="page-break-before: always"></p>-->
    </template>
    <template id="quoteso_report">
        <t t-call="web.html_container">
            <t t-foreach="docs" t-as="doc">
                <t t-call="test_report.quote_documentss"/>
            </t>
        </t>
    </template>
</odoo>

Hi, 

This problem occurs if you change the paper format. so if you change it then try to adjust width and height.

If not then you can use your own custom header and footer by creating templates and calling it in your template.

You can refer the code of external_layout and internal_layout templates from report_templates.xml file in web module.