Mac OS tripped me up with their new-ish “group things by month” in the recent folder. I didn’t realize those buckets were side scrollable. Scrolling is so easy to do that I’m not sure why it’s even necessary to limit the number of items in view. But I’ve been a computer user for a LONG time and was seriously stumped by this behavior because there was zero affordance to indicate there were more items. No less horizontally, which is very unexpected behavior.