Was probably fixed in a patch way back then. Can you upload Config_DX11.ini found in Le Mans Ultimate\UserData?
Here is my config file. I tried changing widescreenUI and widescreenHUD but they just revert back to 0 after i start the game.
//[[gMa1.002f (c)2016 ]] [[ ]]
[COMPONENTS]
VideoGUID=00002704-0000-0000-0000-000000000000
VideoDriver=0
VideoResW=10320
VideoResH=1440
VideoRefreshRate=144
VideoMode=123
VideoRefresh=0
WindowedMode=0
Borderless=1
VrMirror=0
EPostProcessingSettings=3
MSAA=4
VSyncMode=0
UseFXAA=0
ShaderLevel=0
SubViews=2
UseSubViewParams=1
WorkaroundFlags=0
ViewParams=(0.940, 0.393, 0.800, 60.000, 0.006) // screen width (m), screen height (m), eye distance (m), side angle (deg), bezel gap (m)
LeftView=(0.940, 0.393, 0.800, 60.000, 0.006)
RightView=(0.940, 0.393, 0.800, 60.000, 0.006)
PreferredGPU=-1
WidescreenUI=0
WidescreenUIWidth=511
WidescreenHUD=0
CustomVidRes=(0, 0)
VRUIScale=(1.000, 1.000, 1.000)
MinimumVidRes=(800, 600)
MaximumVidRes=(99999, 99999)
[INSTALL]
InstallFrom=
InstallTo=
[AUTOLAUNCH]
Mode=Off
LaunchTime=600
[VERSION]
Version=-1.000000