Hi, I’m Arlene, happy to help!
If two-finger scrolling stopped working, first go to Settings > Bluetooth & devices > Touchpad and make sure two-finger scroll is turned on. If it is on, try restarting your laptop. If it still doesn’t work, update your touchpad driver in Device Manager under Mice and other pointing devices.
Please let me know how it goes.
Regards,
Arlene D.