How to turn off motion blur?

[MakerLinux]

I know this might have been asked before, but I searched for more than one hour in these forums, on reddit and on google and I couldn't get the answer.
How do I turn off motion blur? It's awful and detracts a lot from the experience.
Screenshot for an example of how bad it is, rotating the third-person camera when flying a Katana:
https://i.imgur.com/cjkfOxd.jpg

The most I could find here is someone that used a Reshade mod to ameliorate this, but it uses edge detection, is quite flawed and even adds more processing to the pipeline. Is it really the case that it can't be turned off with regular game options? Why?

And it seems to me that drawing these extra shapes is an additional cost, right? Really, why can't I turn it off? Or can I?

Note: I don't use any upscaling, I use MSAA 2x for antialiasing, everything else is maxed out.

[Alan Phipps]

I think that the best that you can do in game is to turn off chromatic aberration and distortion options for quite minor changes. I know that Nvidia RTX cards may have some additional related post-processing options in their control panel but I don't know if those would generally affect intentional in-game effects that much.

The smoothness of such effects will also depend a lot on current frame rate (hence vsynch might be a factor too) and rotation rate at the time.