No affect from flux

[sprite9000]

Flux has no affect on my screen
see video: https://streamable.com/j1cqbg
any idea why?
LAPTOP MODEL: HUAWEI MATEBOOK

[mvtohtnzkaafwfvwpw]

I think I have a similar problem, double click on the curve under the slider to run a 24h preview, after that it activates for me.

https://i.imgur.com/oTxPnw9.png

(double click anywhere in the red square)