hi @nounouno5402 ,
This seems to be the answer install English United States
Windows 11
Go into Settings → Time & Language
Click Language and Region
Click Preferred Language
Click Add a Language
In search bar type English United States
Click “Next”
Click tick box for “Set as my Windows Display Language”
Click install
Message about waiting for few minutes for this to install
There is a message to Sign Out to install English United States
sign back in and you are English (United States)
Try and open UE 5.3 if this works it’s a problem with interpreting Windows 11 Japanese Keyboard drivers, but seems to be fixed below
Now open a new Blank project wait for Shaders to compile and set to Japanese
To change these settings, follow these steps.
In the menu bar of the Editor, click Edit > Editor Preferences. In the Editor Preferences dialog,
In General section
and select “Editor Language” type “Japanese” in the language Everything will display in Japanese. Click ok and close your project
Now this is working
Go into Windows Settings → Time & Language
in Preferred Language search bar type
Japanese
Click “Next”
Click “set as my Windows Display Language”
Sign out and sign back in as Japanese language
Open UE 5.3 should open project in Japanese
For futher refence see Unreal Fortnite (UEFN)
“User Options” are not translated correctly in the UEFN Editor