Any diagram powered by SmartDraw's Intelligent Formatting engine and automatic connectors are equipped with SmartAction buttons that help you build your diagram.
In a flowhcart, the SmartAction buttons are the yellow arrows that appear as you hover over the shape:
Clicking on a yellow arrow in the direction you want to add a shape will automatically add the selected shape in your library and connect it with an automatic connector to the previous shape.
If you wish to turn these SmartAction Buttons off, simply deselect Display SmartAction Buttons from the SmartPanel.