Why is Screen lying about the size of my iPhone screen?

Screen.width and Screen.height are reporting 768 x 1024 (or in landscape mode, they report 1024 x 768). But this is an iPhone 6s; its screen is actually 750 x 1334. That’s not the same aspect ratio at all (1.79 vs. 1.33). And so my layout, which is adjusted based on the reported Screen values, gets stretched.

Any idea why Screen is lying to me about the screen size, and how I can make it stop (or ignore it and find out the screen size some other way)?

More details: this is Unity 2019.3.15f1; my phone’s running iOS 14.4. My project settings look like this:

6850919--797978--upload_2021-2-18_6-45-36.png

Nothing there about 1024 or 768 that I can see. But, though it shouldn’t matter, that is the resolution set in the PC/Mac/Linux settings (this is a cross-platform project):

6850919--797981--upload_2021-2-18_6-46-41.png

So is that default screen width/height from the desktop settings somehow leaking over into my iOS project, and causing Screen to behave as if that were the screen size?