Edit: I just went to double check my Settings again, hoping to find something, and under Display & Brightness, at the very bottom, I'm pretty sure there's a setting that wasn't there before. "Display Zoom" was set to Larger Text, and changing it to Default immediately brought everything down to a size that actually seems even smaller than I was able to get it before.
I suppose I received some kind of update it just didn't tell me about? I have no idea why Larger Text would be the default setting, when the smaller option is literally called Default. But that seems to be problem solved.
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I've just woken up and went to check my notifications, and everything on screen is noticeably larger. Notifications, text in apps, the keyboard, even navigation buttons in Safari are running into each other. Bizarrely, the only thing that doesn't seem to be blown up is the Settings.
Zoom is not enabled, I have the text size set to the minimum it will allow (which was already larger than I really wanted it to be), and I did not restart the phone of receive any updates that I'm aware of.
I can't find any information about this happening to anyone else, or even a hint at how to possibly fix it. Is there any way at all to get the text size or display scaling to go any smaller? A third party app or a hidden developer setting? Do I need to jailbreak my phone just to get reasonable text sizing? It feels like nothing fits on the screen and it's borderline unusable.
I'm on an iPhone 17 running iOS 26.5.1