Troubleshooting steps and results, in no particular order:

Roll back Windows 11 to Windows 10 - downsampling from 4K render to 1080p monitor now works the way it used to, which is to say functionally. Re-upgrading to Windows 11 re-introduces the problem

Repair FF14 installation in Windows 11 - no effect, bug persists

Uninstall and reinstall FF14 in Windows 11 - no effect, bug persists

Run FF14 with no other applications open in Windows 11 - no effect, bug persists

Boot FF14 at 1080p in Windows 11- playable

Boot FF14 in Windows 11 at 1080p and subsequently change resolution to 4K - bug persists, reverts back to 1080p after 15 seconds without a (good) way to interact with confirmation dialog box

Boot FF14 at 4K via GeForce Experience in Windows 11 - bug persists, need Task Manager to shut game down

Pray to Hydaelyn to smite the gremlin living in Windows 11 - no effect, bug persists

-=-=-=-=-=-=- System Information -=-=-=-=-=-=-

SYSTEM_OS Windows 11 Home 64-bit (6.2, Build 9200) (22621.ni_release.220506-1250)
SYSTEM_CPU AMD Ryzen 7 5800X 8-Core Processor (16 CPUs), ~3.8GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 16 SYSTEM_CORE_PHYSICS 8
SYSTEM_BIOS F33h
SYSTEM_LANGUAGE English (Regional Setting: English)
SYSTEM_MEMORY 32711.734MB
SYSTEM_VIRTUAL_MEMORY 134217727.875MB
SYSTEM_PAGE_FILE 85959.734MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 930.750GB SYSTEM_FREEDISC_SPACE 461.561GB
SYSTEM_STORAGE D:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 3726.006GB SYSTEM_FREEDISC_SPACE 3300.895GB
SYSTEM_DIRECTX_VERSION DirectX 12
SYSTEM_GRAPHICS NVIDIA GeForce RTX 3070
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP NVIDIA GeForce RTX 3070
SYSTEM_GRAPHICS_MAKER NVIDIA
SYSTEM_GRAPHICS_VRAM 8031.000 MB
SYSTEM_GRAPHICS_SHARED_VRAM 16355.867 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 1920 x 1080 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_da725289af73928f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_da725289af73928f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_da725289af73928f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_da725289af73928f\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 31.00.0015.2849
SYSTEM_GRAPHICS_DRIVER_DATE 2/1/2023 18:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_GRAPHICS NVIDIA GeForce RTX 3070
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY2
SYSTEM_GRAPHICS_CHIP NVIDIA GeForce RTX 3070
SYSTEM_GRAPHICS_MAKER NVIDIA
SYSTEM_GRAPHICS_VRAM 8031.000 MB
SYSTEM_GRAPHICS_SHARED_VRAM 16355.867 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 1680 x 1050 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_da725289af73928f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_da725289af73928f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_da725289af73928f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_da725289af73928f\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 31.00.0015.2849
SYSTEM_GRAPHICS_DRIVER_DATE 2/1/2023 18:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_SOUND Realtek Digital Output (Realtek(R) Audio)
SYSTEM_SOUND_DEVICE_ID {8825A293-B608-41AB-9260-D006414258D9}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.0.9225.1
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 8/16/2021 18:00:00
SYSTEM_SOUND Speakers (XSplit Stream Audio Renderer)
SYSTEM_SOUND_DEVICE_ID {6267902E-9288-42C2-8D39-1A22308D3AB3}
SYSTEM_SOUND_DEVICE_NAME xspltspk.sys
SYSTEM_SOUND_DRIVER_VERSION 2.0.2105.2401
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 5/23/2021 18:00:00
SYSTEM_SOUND Speakers (Yeti Classic)
SYSTEM_SOUND_DEVICE_ID {55C586A7-F761-465C-9E1A-869B9D306017}
SYSTEM_SOUND_DEVICE_NAME USBAUDIO.sys
SYSTEM_SOUND_DRIVER_VERSION 2022.11.0.0
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 10/27/2022 18:00:00
SYSTEM_INPUT {6F1D2B60-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 3 SYSTEM_GAMEPAD_BUTTON 8 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 128 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {92B1EC00-AAD2-11EB-8001444553540000}
SYSTEM_INPUT_NAME Yeti Stereo Microphone
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 1 SYSTEM_GAMEPAD_BUTTON 8 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {92B23A20-AAD2-11EB-8002444553540000}
SYSTEM_INPUT_NAME Yeti Stereo Microphone
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {78249C30-53B3-11ED-8001444553540000}
SYSTEM_INPUT_NAME Mountain Everest Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {1854E2C0-A4A8-11EC-8001444553540000}
SYSTEM_INPUT_NAME Gaming Mouse G600
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {92B26130-AAD2-11EB-8005444553540000}
SYSTEM_INPUT_NAME CORSAIR iCUE Commander CORE
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {92B28840-AAD2-11EB-8007444553540000}
SYSTEM_INPUT_NAME ITE Device(8595)
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {7824EA50-53B3-11ED-8002444553540000}
SYSTEM_INPUT_NAME Mountain Everest Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 4096 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {C0E1C690-AC5D-11EB-8002444553540000}
SYSTEM_INPUT_NAME Corsair composite virtual input device
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 1024 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {78253870-53B3-11ED-8003444553540000}
SYSTEM_INPUT_NAME Mountain Everest Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 184 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {92B2AF50-AAD2-11EB-800A444553540000}
SYSTEM_INPUT_NAME ITE Device(8595)
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {92B2D660-AAD2-11EB-800C444553540000}
SYSTEM_INPUT_NAME CORSAIR iCUE Commander CORE
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {92B2D660-AAD2-11EB-800D444553540000}
SYSTEM_INPUT_NAME Logitech StreamCam
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {92B2D660-AAD2-11EB-800E444553540000}
SYSTEM_INPUT_NAME Controller (Xbox One For Windows)
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 5 SYSTEM_GAMEPAD_BUTTON 16 SYSTEM_GAMEPAD_FOV 1


Two last pieces of system information that may or may not be relevant:
-I use two monitors. The primary is 1080p (1920 x 1080), the secondary is 1680 x 1050. The game is only displayed on the primary.
-I have an XB1 controller attached to the computer, but my preferred inputs are a Logitech G600 MMO mouse and a Mountain Everest keyboard.