Google：将知识面板折叠为按钮

// Collapse the right knowledge panel into a small toggle strip
const ID = 'jz-gsr-kp-toggle';
function setup() {
  const rhs = document.getElementById('rhs');
  if (!rhs || document.getElementById(ID)) { return; }
  rhs.style.display = 'none';
  const btn = document.createElement('button');
  btn.id = ID;
  btn.textContent = 'Show knowledge panel';
  btn.style.cssText = 'margin:8px 0;padding:6px 12px;cursor:pointer;'
    + 'border:1px solid #dadce0;border-radius:18px;background:#fff';
  btn.addEventListener('click', function () {
    const on = rhs.style.display === 'none';
    rhs.style.display = on ? '' : 'none';
    btn.textContent = on ? 'Hide knowledge panel' : 'Show knowledge panel';
  });
  const col = document.getElementById('center_col') || rhs.parentElement;
  col.insertBefore(btn, col.firstChild);
}
setup();
const obs = new MutationObserver(setup);
obs.observe(document.documentElement, { childList: true, subtree: true });