I too have 3 4k monitors at home (in the "office", which is really the shed at the bottom of the garden); all of them are linked to a work machine and my own Mac Studio.

It's not one button, it's 3, one per KVM, but yep - I just tap the button on each KVM (under the monitors) and the desktop changes, the mouse/keyboard work, and the other machine is up and running in front of me.

Even the webcam mounted to the monitor switches over - because it's not just mouse/keyboard, there's a couple of USB ports too.

One thing I'd recommend (because otherwise wiring gets unmanageable) is to bunch together the mouse, keyboard, video cables using some split-sheathing. I have an 8-way KVM for the main monitor (all ports used) and this makes it much easier to figure out what's going where.

Dell makes monitors with built-in KVM switches. At home, I have one single monitor, webcam keyboard, and mouse between my work computer and home computer, and I switch between them with a software defined keyboard combo. I highly recommend.

I recommend it!

You can get KVMs that switch multiple monitors, but you pay more for multiple monitors and for multiple input types (HDMI & Display port), so depending on your setup, it may make sense to have the some monitors on the switch but manually select inputs on others.

KVMs tend to work well, except

- you need to pause for a second when switching to allow the USB devices to reconnect, or sometimes things get into a weird state, like keyboard thinking a modifier is pressed

- rarely things get confused anyway, and I have to unplug and re-plug in devices to one of the computers. Cheaper KVMs and smarter mice and keyboards seem more prone to this.

In conjunction with a KVM for switching the USB between devices, you can use this software to automatically swap the inputs on the monitor (if your monitors support the command protocol, most do but one of mine doesn't support the "change input" instruction): https://github.com/haimgel/display-switch

Otherwise you'd need a KVM that supports 3 monitors which I'd imagine is a compatibility nightmare if they're beyond 1080p@60hz

I have a personal computer, a work computer and a gaming computer and I switch between them using an Aten USB switch [1] and this software that switches monitor inputs when your plug/unplug USB devices [2]. Works quite well and costs less than 50€.

[1] https://www.amazon.de/dp/B00B1SENTE/

[2] https://github.com/haimgel/display-switch

Yes. https://www.amazon.com/gp/product/B07MMZ1W1Q/ref=ppx_yo_dt_b...

As someone that drastically simplified their desk setup for 3 computers this year: YES. A KVM would easily solve this.

You would need a triple monitor KVM with at least 2 USB inputs. You could also get an Ultrawide monitor to simplify further, which is what I have done.

Displays often support input switching using DDC/CI, so a simple script should allow you to switch all the displays over.