Lenovo ThinkVision P40w-20 39.7" 5K Ultrawide Curved Monitor - Manual (Page 17)

Chapter 1 Get started with your monitor 1-13
eKVM & KVM
Built-In KVM Switch give user to operate two PC which connecting
USB Type-B and Type-C upstream ports, also user can use USB keyboard or USB mouse to reach the
same function, called eKVM.
How to enable KVM and/or eKVM
Option 1
The hotkey of KVM locate on the specific button of front bezel.