The false bottom effect

There is a known UX issue called the false bottom effect.

It happens when a dropdown's visible height exactly matches the visible items, so users assume there is nothing more below.

On macOS this becomes worse because scrollbars may stay hidden until hover.

False bottom bad example
No visible clue that dropdown has more items
False bottom improved example
A partially visible next item hints that content continues

Source: CXL article on false bottom effect

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