I had the same problem, tho the option has dissapeared from the mouse-settings, you can still change it in your Windows Registry.
Warning : you need to have some registry knowledge, it's important to backup your registry first to avoid causing problems with your Windows Installation.
1: Right click the start-button and select
"Run" Type
"Regedit.exe" and press enter.
2: Navigate to the following registry path
"HKEY_CURRENT_USER\Software\Elantech\OtherSetting"
3: Find the name
"DisableWhenDetectUSBMouse" and change D-Word value from
"0" to
"1"
4: Close Regedit and Sign-out from Windows, then sign back in to load the new mouse-settings.
If it doesn't work, also navigate to this registry path
"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Elantech\OtherSetting" and repeat step 3.
Let me know how this works out for you