laptop - How to make monitor edges match on Windows 7

I have two screens. My primary screen is a 3840x2160 laptop screen. My secondary screen is a 1920x1080 monitor. The issue I'm having is that due to the screen resolutions, Windows thinks the laptop monitor is ~4x larger than the external monitor, when in reality the laptop monitor is physically smaller.

What I would like is for the left edges of my laptop monitor to match up with the right edges of the external monitor.

How can I do this?

Edit: Without lowering the resolution of my laptop monitor.

Answer

Natively, you can't get rid of the unaligned edges unless you set the displays to the same resolution, and align the displays (on the side they share) in the display properties.

The program DisplayFusion has an option to prevent bumping against edges when moving between monitors at different resolutions, as well as ones that are not aligned exactly.

I've been happily using DF for years to deal with multiple monitors, and it's handy as heck. :)

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