No functions are shown for the Optimize Size page for Writer. https://help.libreoffice.org/7.6/en-US/text/shared/02/04210000.html?&DbPAR=WRITER
Seth Chaiklin committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/36b8bd4e7d31ff18c9e8ce85718aa8e9a3f1edcd tdf#121367; tdf#153876 followup to workaround <switch> behavior