How to disable and hide the undo/redo buttons in WebViewer

FAQ
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1

You can use the following code to disable redo/undo tools

WebViewer(...)
  .then(instance => {
     instance.disableElements(['redoButton','undoButton'])
     instance.hotkeys.off(instance.hotkeys.Keys.CTRL_Z)
     instance.hotkeys.off(instance.hotkeys.Keys.CTRL_Y)
  });