That syncing is caused by logging into both devices with the same Microsoft account and using OneDrive to sync your files online.
It is not actually syncing the apps and games to your laptop, it is just syncing the desktop shortcuts, by default OneDrive syncs the Desktop, Documents and Pictures folders.
To stop the syncing, you can open OneDrive form its cloud icon on your Taskbar and sign out of OneDrive or unlink the Lenovo laptop in OneDrive, that will stop the files form your other device appearing on the laptop.