Hello I'm Greg, here to help you with this.
First make sure the touchpad software is updated so it gives the latest options, then we check touchpad settings including in the Additional Settings box where the latest touchpad software normally adds an extra tab with more Settings.
- Update the Touchpad driver from the Lenovo Support Downloads web page https://support.lenovo.com/us/en/ using the full model or Serial number.
Compare the latest drivers available for download with the ones presently installed in Device Manager reached by right clicking the Start Menu. Make sure you also have the latest BIOS or UEFI firmware, Chipset, Display (Video), Sound, USB3, Bluetooth, Network and all other drivers, or else download and install the latest now.
If that doesn't help then enter Device Manager reached by right clicking the Start button, go to Mice > Touchpad and then Driver tab. Choose Update Driver, then Automatic to see if it gets a better driver that resolves the problem. If not try Update Driver > Browse > Let Me Pick to try all previously installed drivers.
If that doesn't work then try uninstalling driver, Restart PC using keyboard to Ctrl Alt Del, on blue screen tab to Power Icon in bottom right, press Enter, arrow down to Restart, press Enter to restart to reinstall the driver.
- Go to Settings > Devices > Touchpad to go over the Settings. Then choose Additional Settings which opens the Mouse properties box. The Touchpad software installs a tab onto it - usually the last one - that should have more settings to check, including a checkbox to Disable Touchpad when USB pointing device is attached. This prevents palm drag from causing the cursor to jump
- Try the troubleshooting steps here to turn off touchpad tap to click and gestures:
https://smallbusiness.chron.com/disable-tap-thi...
https://pcsupport.lenovo.com/us/en/products/lap...
https://forums.lenovo.com/t5/Lenovo-IdeaPad-1xx...
https://www.howtogeek.com/755485/how-to-turn-of...
https://www.youtube.com/watch?v=eRnifY2r7-0
- If none of those help I'd ask Lenovo Support or in the Lenovo forums:
https://pcsupport.lenovo.com/us/en/contactus?li...
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
________________________________________________________
Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it