Automatic file update, how do you turn it off?

Ok, I'm not a big fan of my 2D changing even before I save my model. I happen have them both open at he same time. I did a change on the 3D, no save, went to 2D to see something. The change I did on the 3D appeared on the 2D...no no. I want to control the update process. How do you change it?

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