If windows that span two monitors look vertically skewed even though your panels and the Windows display diagram appear perfectly aligned, the problem is almost always a small vertical offset buried in Windows' own monitor arrangement. LittleBigMouse smooths your cursor across the seam so you never feel it, but Windows still positions window geometry using its internal layout — so fix that layout first, then resync LittleBigMouse, and the seam straightens out.
Why a "perfectly aligned" setup can still be off
Windows maintains its own coordinate map of every connected display, built from how you dragged the monitor tiles in Settings > System > Display. That drag-and-drop editor is coarse: the boundary between two 1080p screens can easily end up a handful of pixels higher on one side than the other, and nothing in the settings UI makes that obvious at a glance.
Here's the trap: LittleBigMouse only changes where the pointer crosses between screens. Window placement is handled by Windows itself, using its own layout. So if the right-hand screen sits slightly lower in Windows' map, the right half of any straddling window is drawn higher than the left half — exactly the skew you're seeing. Meanwhile, LittleBigMouse actively hides the evidence, because with it running your cursor glides across the boundary without the telltale jump.
There is one other possibility: the monitors themselves. Even two identical models on identical stands rarely sit at exactly the same height, and a few millimeters of physical difference reads as a crooked seam just as clearly as a software offset.
A two-minute test to find the real cause
Before changing any settings, determine whether the offset lives in Windows or on your desk:
- Fully exit LittleBigMouse — quit it from the system tray rather than just disabling a feature.
- Move the pointer slowly across the boundary between the two monitors, repeating the pass near the top, middle, and bottom of the screens.
- Watch what happens at the exact moment it crosses.
If the cursor jumps up or down at the edge, Windows' layout is offset — proceed to the fix below. If the crossing is perfectly smooth at every height but the windows still look skewed, Windows is innocent and the panels themselves are physically uneven; adjust the stands or mount arms until the top bezels are level, measured against a straightedge or the wall behind them.
Correcting the offset in Windows display settings
Once you've confirmed the offset is in Windows' layout, correct it directly:
- Open
Settings > System > Display. - Click Identify so you know which numbered tile corresponds to which physical monitor.
- Select the tile that sits too high or too low relative to its neighbor and drag it vertically until the top edges of the two rectangles line up exactly. Work in small increments — a few pixels of error is all it takes to cause the problem.
- Click Apply, then Keep changes.
- Repeat the pointer-crossing test from the previous section. Nudge and re-test until the cursor passes dead level at every height.
It's iterative by nature: because the editor doesn't give you numeric coordinates, the pointer test is your measurement tool. Two or three rounds of nudge-and-test is typical.
Getting LittleBigMouse back in sync
Once Windows' layout is correct, don't let LittleBigMouse flatten your work. Open its configuration and use the option to load the layout from Windows — labeled "Place from windows config" — so its zones mirror the arrangement you just refined, including the vertical offset.
If you're running a version older than 5.6.0, update first. That release fixed a bug in which the vertical offset between screens was lost, meaning the tool could discard alignments you had carefully dialed in and quietly reintroduce the skew. Updating before resyncing saves you from fixing the same offset twice.
Keeping the alignment stable over time
- Re-run the pointer test after GPU driver updates, dock reconnections, or any change to resolution or refresh rate — these can shuffle Windows' stored layout.
- Keep both monitors at the same resolution and the same scale factor. Mismatched scaling changes the effective pixel height of each screen and can reintroduce an offset even on identical panels.
- If you physically move or re-mount the monitors, redo both steps in order: Windows layout first, then the LittleBigMouse resync.
A third display at a different resolution (such as a 1920x1200 laptop panel) doesn't cause the seam between your two matching externals, but its position in the layout diagram can shift things when it reconnects, so it's worth a quick recheck after docking changes.
Frequently Asked Questions
Both monitors are the same model and resolution. Can Windows still misalign them?
Yes. Windows' layout is stored independently of the hardware; a slightly imprecise drag in the display settings is enough to offset one screen by a few pixels, and identical hardware doesn't prevent that.
Why does my cursor cross smoothly but windows still look skewed?
Because LittleBigMouse remaps only the pointer's crossing point. Window geometry comes from Windows' own coordinates, so a hidden offset shows up in window placement even when LittleBigMouse makes the cursor feel seamless.
The pointer test shows no jump — so why is the seam still crooked?
Then Windows' layout is fine and the monitors themselves are physically misaligned. Measure the top bezels against a straightedge and adjust the stands or arms until they're level.
Does display scaling affect alignment?
It can. If one monitor uses 125% scaling and the other 100%, their effective coordinate heights differ and alignment gets messy. Set both matching panels to the same resolution and scale factor before fine-tuning.
Which LittleBigMouse version fixes the vertical offset problem?
Version 5.6.0 and later. Older versions could lose the vertical offset between screens, undoing your alignment. Update, then use "Place from windows config" to pull in the corrected layout.
My laptop screen runs at a different resolution — is it part of the problem?
Not directly. The skew occurs at the seam between the two external panels, but the laptop's tile position in the layout can shift when it connects or disconnects, so re-verify alignment after docking changes.