It's far from the worst piece of UI design still kicking about. The way MMC windows scale for what looks like 640 x 480 monitors means every emergency trawl through an event log begins with setting the window to a usable format first.
The list of ports (IP addresses) on the printer Properties / Ports tab is a mess too - the selected one is always at the bottom of the list, there's not enough lateral space to display the useful bit of the IP address and as soon as you expand it to show that, it knocks the selected line off the bottom of the list. Burying it behind a load of submenus in Windows 11 hasn't helped. Thanks, MS.
The worst I ever had to deal with (thankfully no longer) was the list of mobile phones associated with a user account in Exchange - it was slightly less than one line deep IIRC, floating in a large grey empty dialogue box with space enough for a decent 10 line select. Like a lot of Exchange, it gave the impression it had been thrown together by the work experience kid.