See this forum post from the Manjaro forums: https://forum.manjaro.org/t/missing-mouse-settings/51732 It seems there are two different setting pages which are displayed based on some property. Is this wanted and when will it be one page showing all settings again?
This is intentional, because the mouse KCM has two backends: Evdev and Libinput. They expose different features, and therefore need different user interfaces. The current touchpad KCM attempts to use the same interface for multiple backends and it's super confusing, since most things are grayed out when using Libinput, and a lot of its features aren't exposed at all.
Alright. Thanks for the explanation!