Lower Mouse Speed/Mouse Deceleration

I set the mouse acceleration via xfce gui settings to 0. However, my mouse speed is still too high. So I tried to fix this using the arch-wiki article on mouse acceleration. I cannot execute xinput, so I created the 50-mouse-acceleration.conf file (in /etc/X11/xorg.conf.d/) with the following content:

Section "InputClass"
	Identifier "MyMouse"
	MatchIsPointer "yes"
	Option "ConstantDeceleration" "2"

I restarted my machine but my mouse speed remained the same.
Additionally, I tried to manually change the mouse acceleration by setting the “acceleration” property to a negative value in ~/.config/xfce4/xfconf/xfce-perchannel-xml/pointers.xml but this did not work either.

Is there any other way to lower my mouse speed?

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Just to be sure, in the GUI, did you choose your mouse in the drop down list, because the default selectioned item is the keyboard.

Yes. I selected the right device and changing the mouse speed via the GUI works fine. The 0 setting is just not low enough for me :frowning:

Mouse may has a high dpi value. If it supports adjustability with a tool like Logitech MX mouses application Solaar, it may work slower