If you Are using Odoo 18 Community Edition Then Follow This steps.

• Enable Developer Mode.
• Navigate to "Settings / Technical / User Interface / Views" page.
• Search for "hsn summary" as "View Architecture" just like showing in below image

• We found only one Result with "View Name" as "l10n_in_report_invoice_document_inherit" in filter and open this view.
• Scroll Down to the code in the "Architecture" tab and find the below code and comment out.

• <t t-if="hsn_summary">
      <div name="l10n_in_hsn_summary" class="mt-3" style="page-break-inside: avoid;">
          <h3>HSN Summary</h3>
          <table class="table table-sm table-borderless col-6">
              <thead>
                  <th>HSN/SAC</th>
                  <th class="text-end">Quantity</th>
                  <th class="text-end">Rate %</th>
                  <th class="text-end">Taxable Value</th>
                  <th class="text-end" t-if="hsn_summary['has_gst']">SGST</th>
                  <th class="text-end" t-if="hsn_summary['has_gst']">CGST</th>
                  <th class="text-end" t-if="hsn_summary['has_igst']">IGST</th>
                  <th class="text-end" t-if="hsn_summary['has_cess']">CESS</th>
              </thead>
              <tr t-foreach="hsn_summary['items']" t-as="item">
                  <td t-esc="item['l10n_in_hsn_code']"/>
                  <td class="text-end">
                      <span t-esc="item['quantity']"/>
                      <span t-if="hsn_summary['display_uom']">(<t t-esc="item['uom_name']"/>)</span>
                  </td>
                  <td class="text-end" t-esc="item['rate']"/>
                  <td class="text-end">
                      <span t-esc="item['amount_untaxed']" t-options="{'widget': 'monetary', 'display_currency': o.currency_id}"/>
                  </td>
                  <td class="text-end" t-if="hsn_summary['has_gst']">
                      <span t-esc="item['tax_amount_sgst']" t-options="{'widget': 'monetary', 'display_currency': o.currency_id}"/>
                  </td>
                  <td class="text-end" t-if="hsn_summary['has_gst']">
                      <span t-esc="item['tax_amount_cgst']" t-options="{'widget': 'monetary', 'display_currency': o.currency_id}"/>
                  </td>
                  <td class="text-end" t-if="hsn_summary['has_igst']">
                      <span t-esc="item['tax_amount_igst']" t-options="{'widget': 'monetary', 'display_currency': o.currency_id}"/>
                  </td>
                  <td class="text-end" t-if="hsn_summary['has_cess']">
                      <span t-esc="item['tax_amount_cess']" t-options="{'widget': 'monetary', 'display_currency': o.currency_id}"/>
                  </td>
              </tr>
          </table>
      </div>
  </t>

• Now Save the page and Check in the Invoice.