The default behavior in the docs shows functionality that shows and hides the bar as you scroll. https://material-components.github.io/material-components-web-catalog/#/component/top-app-bar/standard
Yea I noticed this in 5.x also, I figured you where aware 馃槈 If you don't have it implemented yet maybe look at how react-headroom is doing it?
Fixed in the 5.2.0-alpha.0
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Fixed in the 5.2.0-alpha.0