But as far as I know, there was no option in the Divinity games to turn off these kind of effects :-/
They didn't exist.
Ehm.... and what's that beginning at around 4:47 for example?
https://www.youtube.com/watch?v=rMBbsCodFKk That whole fight is full of screenshaking.
I have seen these kind of effects in several gameplay videos of DOS 2. And in BG3 this is all over the place. Almost every ability in the BG3 gameplay triggered a screenshaking effect...