If you’re planning on getting a second monitor for your work station, it is always a good idea to get one that supports the same resolution as the monitor you plan to use it with. When you have multiple monitors set up on Windows 10, you have to align them so that their edges are right next to each other. This allows the mouse cursor to move between them easily. Unfortunately, if the monitors aren’t the same resolution, the edge of one will fall short of the other. You won’t be able to move the cursor between different resolution monitors along the edge that doesn’t line up. This will be most noticeable along the corners.
To fix this, you need an app called MouseUnSnag. It does two things; it lets you move the cursor between different resolution monitors as though their edges line up perfectly, and it disables the sticky edge that Windows 10 has between monitors.
Move cursor between different resolution monitors
Download and run MouseUnSnag. It can’t be minimized to the system tray but you can minimize the app’s window. If you keep it open, it will show you the coordinates of your mouse movement. Once the app is running, you will be able to move the cursor between your different resolution monitors as though they both had the same resolution and their edges line up corner-to-corner.
Given that you’re working with two monitors at the least, you can move the MouseUnSnag window to your secondary monitor to keep it out of the way.
Windows 10 has excellent support for multiple monitors but it should provide something that allows users to work more comfortably with monitors that aren’t the same resolution. It may be a good idea to buy a second monitor that is the same resolution as your first one but a user may want to upgrade to a UHD or even 4K monitors. Working with a high resolution monitor and one with a lower resolution shouldn’t come with this sort of friction.
The way the cursor refuses to move between an empty area of the edge of a screen where the second screen doesn’t meet it, is how it is supposed to work. It is intentional however, there should be an off switch. The behavior isn’t hard to ‘fix’ and Windows 10 could easily add an option to enable something like MouseUnSnag. It could also do with giving users a way to disable the sticky edge which makes moving the cursor between monitors of the same resolution a bit inconvenient.