There actually IS a way to disable the subtitles in those prerendered cutscenes.
You'll have to manually edit your config file:
- navigate to "C:\Users\YOURUSERNAME\Documents\The Witcher 3"
- open the file "user.settings" with notepad
- find the entry "Subtitles" in the group "[Audio]" (NOT the one in the group "[Localization]")
- change the line, so it says "Subtitles=false"
If you don't have the entry "Subtitles" in the group "[Audio]", just add these lines to the end of the file:
[Audio]
Subtitles=false
Now all subtitles should be disabled, even during prerendered cutscenes.
Normally the in-game setting under "Options > Language > Subtitles" won't disable all subtitles, but with this change the subtitles for the following cutscenes will also be disabled:
- intro movie before main menu
- loading screens
- special scenes during story (e. g. when Geralt dreams about training young Ciri and Kaer Morhen gets attacked by the Wild Hunt)
But be warned: this setting completely overrides the in game setting under "Options > Language > Subtitles", so you won't be able to re-enable subtitles by changing that setting. If you want to enable subtitles again, you'll have to go back to the file "user.settings" and change it again:
[Audio]
Subtitles=true
This way the game will use the in game setting again.