How can remove the horizontal line in the end of overleaf template?

I’m working on an expose (research proposal) and I selected this template in overleaf which is 2 columns. now the problem is I want to include bibliography right after section{References} but from nowhere there is horizontal line avoid that and result in losing its comprehensiveness:

documentclass[%
 reprint,
%superscriptaddress,
%groupedaddress,
%unsortedaddress,
%runinaddress,
%frontmatterverbose, 
%preprint,
%preprintnumbers,
%nofootinbib,
%nobibnotes,
%bibnotes,
 amsmath,amssymb,
 aps,
%pra,
%prb,
%rmp,
%prstab,
%prstper,
%floatfix,
]{revtex4-2}

usepackage{graphicx}% Include figure files
usepackage{dcolumn}% Align table columns on decimal point
usepackage{bm}% bold math
usepackage{hyperref}% enables hyperlinks in the PDF
usepackage{wrapfig}
usepackage{lipsum}

begin{document}

title{small Exposé für Geschäftsidee  LARGE Proposal Title}% Force line breaks with 


section{References}

bibliography{bibfile}% Produces the bibliography via BibTeX.

end{document}

I checked this post but sadly wasn’t my case.
So far the output is as follows:

I was wondering if there is an elegant way to fix it. Any helps will be appreciated.

documentclass[%
 reprint,
%superscriptaddress,
%groupedaddress,
%unsortedaddress,
%runinaddress,
%frontmatterverbose, 
%preprint,
%preprintnumbers,
%nofootinbib,
%nobibnotes,
%bibnotes,
 amsmath,amssymb,
 aps,
%pra,
%prb,
%rmp,
%prstab,
%prstper,
%floatfix,
]{revtex4-2}

usepackage{graphicx}% Include figure files
usepackage{dcolumn}% Align table columns on decimal point
usepackage{bm}% bold math
usepackage{hyperref}% enables hyperlinks in the PDF
usepackage{wrapfig}
usepackage{lipsum}
defbibsection{section*{refname}}&&&&&&<---added
begin{document}

title{small Exposé für Geschäftsidee  LARGE Proposal Title}% Force line breaks with 
section{References}
bibliography{bibfile}% Produces the bibliography via BibTeX.

end{document}