Maximalist UI's
Back when all screens were more-or-less the same size and nothing ever had to scale. Your UI was the size it was, and if your screen was too big, too bad! You can either stretch it and deal with the pixelly mess, or squint your eyes to see the teeeny tiny program.
“For VGA 640x480 256 colors”
Most of these ran fullscreen and changed the resolution to 640x480 or 800x600, which most monitors supported. I had a widescreen LCD that would always stretch to fill, quite annoying…