Changing formatting only for the bibliography section

Question

is there a way of changing the page formatting only for the bibliography of a huge tex project (a Ph.D. Thesis)?
Specifically, I would like to reduce the left and right white space of the pages only for the bibliography (with the purpose of inserting more biblio in a single page). Better, if I can also scale down the size of the letters (only in that section, of course). Any hint to achieve the goal is highly appreciated.
Here the code
pdfminorversion=5 % default is 4; 5 or more required for

pdfobjcompresslevel
pdfcompresslevel=9 % default is 9
pdfobjcompresslevel=2 % default is 0

documentclass[a4paper,12pt,twoside]{book}
usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}

%...
begin{document}

%...

bibliographystyle{something_here}
bibliography{biblio}

end{document}

Peter Wilson · Answer

You can use the adjustwidth environment from the chngpage package.
Try the following MWE.
% changepageprob.tex  SE 570925
documentclass{book}
usepackage{chngpage}
usepackage{lipsum}

begin{document}
lipsum[1]

begin{adjustwidth}{-1cm}{-2cm}
footnotesize
lipsum[2]
newpage
lipsum[3]
end{adjustwidth}
lipsum[4]

end{document}

The two arguments to adjustwidth are the amounts to be added to the left and right margins. A negative value will reduce the margin.
Inside the adjustwidth I used footnotesize to reduce the font size.

Changing formatting only for the bibliography section

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