Most monitors have 2-3 inputs. Mine has a desktop, a laptop, and occasionally my phone attached to it, using HDMI, DP, and another DP / USB-C respectively.
Unless you switch really often and want subsecond switching time, three's no need to even use a KVM to switch the monitor.
Even at twice per day switching using monitor controls would drive me nuts. The buttons, the menu, the delays, blanking and disconnects. By then I already forgot why I was even switching
Most of the time the reason for a KVM is wanting to switch the monitor, mouse and keyboard, and possibly other devices (e.g. I want to use the same webcam that remains in the same position) at the same time.
Switching just the monitor isn't really the use case they address.
Unless you switch really often and want subsecond switching time, three's no need to even use a KVM to switch the monitor.