Try this:
Code:
dpkg -s xserver-xorg-input-synaptics
If that package is installed, install instead of it xserver-xorg-input-libinput, purge xserver-xorg-input-synaptics, and logout/reboot. Not sure if that helps with mouse settings, but it sure did help with missing touchpad settings. Reason for that is that newer versions of gnome moved from synaptics to libinput and dependencies still bring in synaptics. At least it was like that in my case.