Topic on Talk:Warhammer 40,000: Space Marine
The option is buried under tons of other settings. For more specifically, if you can't find the option follow this.
Go to Windows 11 settings panel, select 'Time & language', from your primary language (usually at 3rd row from the top) select the right side 3 dots which goes to misc option, click 'Language Options' - Find 'Microsoft input' on your keyboard options (usually at the bottom), and again goes to the right side three dots but this time it's 'Keyboard Options' - Disable whatever fancy options like expanded kanji, and most importantly, select 'Use previous version of Microsoft IME'.
Glad to help!