Can't adjust mouse scrolling

Using KDE 5.19.3 - seems there is no way I can adjust the mouse scrolling.

Here are the relevant screenshots

Any suggestions how to make it adjustable are welcome!


I hope people will see your thread and will help you with this problem.

I assume that you’re referring to scroll wheel speed? If so, this thread may be of interest to you. FWIW, Plasma (Wayland) does have such support, but not Plasma (with X11 environment).