Hide play/pause button for one slide but keep seekbar visible

hi; try this:
Add a trigger on the slide: Execute JavaScript → When the timeline starts on this slide, and paste this in:

(function () {
  // Try the likely selectors for the modern player's play/pause button
  var selectors = ['#play-pause', '#play-pause-btn', 'button[data-model-id="play-pause"]'];
  var found = false;

  selectors.forEach(function (sel) {
    var el = document.querySelector(sel);
    if (el) {
      el.style.display = 'none';
      found = true;
    }
  });

  if (!found) {
    console.warn('Play/pause button not found, check the selector with DevTools');
  }
})();

The play/pause button lives in the player, not the slide, so it stays hidden on every following slide too. To bring it back, add a second Execute JavaScript trigger, either on the next slide or on this one when the user clicks Next, with:

['#play-pause', '#play-pause-btn', 'button[data-model-id="play-pause"]'].forEach(function (sel) {
  var el = document.querySelector(sel);
  if (el) el.style.display = '';
});