So I just checked, and setting the “Application Resolution” slider in the SteamVR settings to 100% makes my resolution 1430 x 1773
Kind of weird, as the Odyssey’s physical resolution is supposed to be 1440 x 1600
EDIT: FOUND IT
Apparently it is a combination of the lens asymmetry and compatibility.
Lens asymmetry causes you to see a different aspect ratio than 1440 x 1600 so Steam games should know this, hence why in SteamVR, games are told to render for 1430 x 1773 (slightly wider)