The Pen Window feature from the previous Note series should be re-introduced. As the Galaxy Note 9 is known for multi tasking and having multiple apps open in split screen mode, I think the Pen Window option, which debuted on the Note 3, on the S pen is a great idea. For those who don't know what this feature is, it's an option that appears when you detach the S pen, which when selected let's the user draw a square/rectangle and it's given a selection of apps to choose from. The selected app then opens in the window drawn by the user. This would bring added functionality to the S pen as I personally feel like it hasn't been really looked at by developers since Samsung released the SDK for it during the Note 9s launch.
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