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Divi - Theme Options - Integration - Add code to the < body >

<script>
(function () {
  var sidebarSel = ".et-vb-sidebar";
  var btnSel = '.et-vb-modal-group-title[data-name="post-type-page"][role="button"]';

  function isSidebarOpen(sidebar) {
    if (!sidebar) return false;
    var r = sidebar.getBoundingClientRect();
    // If it's off-canvas (e.g., translateX), it'll usually be fully outside viewport
    return r.width > 0 && r.height > 0 && r.right > 0 && r.left < window.innerWidth;
  }

  function isCollapsed(btn) {
    var ae = btn.getAttribute("aria-expanded");
    if (ae === "false") return true;
    if (ae === "true") return false;

    // fallback: check the next element (panel) if it exists
    var panel = btn.nextElementSibling;
    if (!panel) return true;
    var cs = window.getComputedStyle(panel);
    if (cs.display === "none" || cs.visibility === "hidden") return true;
    if (panel.getBoundingClientRect().height < 2) return true;
    return false;
  }

  function tryOpenPagesGroup() {
    var sidebar = document.querySelector(sidebarSel);
    if (!isSidebarOpen(sidebar)) return;

    var btn = (sidebar && sidebar.querySelector(btnSel)) || document.querySelector(btnSel);
    if (!btn) return;

    // Only click if collapsed (prevents toggling it closed)
    if (isCollapsed(btn)) btn.click();
  }

  // Run after interactions (opening sidebar, clicking builder UI, etc.)
  function scheduleTry() {
    // small retries to allow Divi to render the group list
    setTimeout(tryOpenPagesGroup, 0);
    setTimeout(tryOpenPagesGroup, 120);
    setTimeout(tryOpenPagesGroup, 350);
  }

  // Any click/tap in the builder UI tends to coincide with opening the sidebar
  document.addEventListener("pointerup", scheduleTry, true);
  document.addEventListener("click", scheduleTry, true);

  // Also when you hover/focus into the sidebar itself
  document.addEventListener("pointerenter", function (e) {
    if (e.target && e.target.closest && e.target.closest(sidebarSel)) scheduleTry();
  }, true);

  document.addEventListener("focusin", function (e) {
    if (e.target && e.target.closest && e.target.closest(sidebarSel)) scheduleTry();
  }, true);

  // initial attempt (in case sidebar is already open)
  scheduleTry();
})();
</script>