Scroll wheel no longer scrolls through timeline, zooms in on preview instead

Before the latest update (version 24.4.1), when you're clicked on the preview, using the scroll wheel moved the timeline, and now it just zooms into the preview. I really need the old feature back as it helps me greatly with the content I create. I've had a look through the preferences and can't seem to find anything to change it back. Any help is greatly appreciated.