Cmd+click (Mac) or Ctrl+click (Windows) on a position path key in the Stage window to delete it. Note that this may not work if the emitter is on top of the key you are trying to delete.
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Cmd+click (Mac) or Ctrl+click (Windows) on a position path key in the Stage window to delete it. Note that this may not work if the emitter is on top of the key you are trying to delete.