Windows arranges a desktop according to display rectangles in Settings, not according to where the monitors physically stand. If those rectangles disagree with the desk, the pointer may cross at an unexpected height or seem trapped at an edge. Correcting the logical arrangement can make the workspace more usable without changing a cable or monitor setting.
Match identities before moving rectangles
Open the display settings using the route available in your Windows version and use Identify to show the numbers on the physical screens. Record which rectangle represents each monitor. Do not assume screen 1 is automatically on the left or is always the laptop panel; numbering reflects detection and can change with the connection path.
Choose an extended arrangement if the goal is separate workspaces. Mirroring or duplicate mode does not provide the same independent rectangles for window placement. If Windows detects only one external picture through a splitter, moving rectangles cannot create a second independent stream. Resolve the actual connection capability before treating it as a layout problem.
Drag the rectangles to reflect the intended left–right and above–below relationships, then apply the change. Use the shared edge where you expect the pointer to cross. When screens have different logical sizes, the full edge may not line up, so a pointer crossing at one height may work while another height reaches an unmatched boundary.
Test transitions through ordinary work
Move the pointer slowly across the relevant edge and drag a window between screens. Check the locations you actually use, such as the middle of the desk-facing edge, rather than aligning only the top corners because the diagram looks neat. The logical arrangement should support predictable movement in the working position.
If one rectangle looks much larger than the other despite similar physical screens, inspect resolution and scaling. Windows maps desktop coordinates according to the configured logical workspace, which may not match physical centimeters. Changing scaling is a separate readability decision, so do not force tiny text merely to make the rectangles look alike in the settings diagram.
Apply changes one at a time and confirm the result remains usable. Keep the settings confirmation route visible and know how to return to the previous arrangement if a mode becomes unreadable. On a shared desk, consider other users and any supported managed configuration before overwriting an established layout.
Save a simple screenshot or note of the verified arrangement, including which display is primary and the modes in use. This is a reference for restoration, not a guarantee that Windows will preserve every identity after a dock change. If the pointer behavior changes later, first compare the detected rectangles with the physical desk before replacing hardware that may still be functioning correctly.