Set the default paper size for a specific TeX Live program to A4

tlmgr paper

  • Manage paper size options of an TeX Live installation.
    More information: <https://www.tug.org/texlive/tlmgr.html>.
  • Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

sudo tlmgr {{pdftex}} paper {{a4}}

click the source code to copy install tlmgr paper on any operating system with command-not-found.com