My apologies -- this appears to be an error on my part. I remembered more information fitting on my screen when I last played OOTP regularly on a 1920 x 1080 monitor (OOTP 19). I booted up my old laptop to check, and that was the case. However, the older OOTP versions used smaller fonts and tighter spacing by default, resulting in more information being displayed and fewer scrollbars. I mistook OOTP's interface changes since then as DPI scaling on my new laptop.
The DPI scaling is working fine. Kindly disregard.