Fixed. The quest log only ever listened for a mouse WHEEL, so on a touch screen there was nothing to hear — and the blue scrollbar on the right was decorative rather than draggable, which is why neither of the two things you tried did anything.

The list now scrolls by dragging anywhere inside it, using the same step size the wheel uses, so a drag moves the same distance a scroll would. Registered and torn down alongside the wheel handler, so it exists exactly when the list is actually scrollable and cannot leave a stray listener behind when you close the window.

On the dev branch, live at the next publish.