Useful when pairing a laptop with an external monitor
Connecting a high-resolution laptop screen alongside a standard-resolution external monitor at the same scale often makes text look too small on one and too large on the other. Setting each monitor's scale independently keeps text and icons at a similar physical size on both.
General information -- results vary by hardware and drivers
Exactly how scaling behaves can vary depending on your graphics driver and specific monitor models, so if something looks off after changing these settings, check for a driver update as well.
Frequently Asked Questions
Does the new scale apply immediately after I change it?
Most apps update immediately, but a few need you to sign out and back in, or restart the computer, before the change displays correctly.
Do I need to reconfigure scaling every time I reconnect a monitor?
No -- once you've set a scale for a monitor, Windows remembers that monitor and automatically reapplies the same scale the next time you connect it.