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Multiple monitor and custom monitor positioning support

Updated

Written for Synergy 3 (v3.7.2) and Synergy 1 (v1.21.4), checked 3 October 2026.

Synergy 1 and Synergy 3 support computers with several monitors. Each computer's monitors count as one big screen, so the mouse moves to another computer at the outer edges of that computer's whole monitor arrangement. Most arrangements work as they are; the sections below cover the ones that need a little setup.

The mouse stops at some of my monitors

If the mouse crosses to your other computer from some of your monitors but stops at others, line your monitors up along the edge that faces your other computer. Do it in your operating system's display settings, where you arrange your monitors, not in Synergy 1 or Synergy 3.

The edge is the one where the two computers meet in the layout: the top edge when your other computer sits above this one, the right edge when it sits to the right, and so on. The steps use the top edge as the example.

Windows 11

  1. Open Start, then Settings.
  2. Click System, then Display.
  3. In Rearrange your displays, drag the displays until their top edges are level. Click Identify to see which display is which.
  4. Click Apply.

macOS 13 and later

  1. Open the Apple menu, then System Settings.
  2. Click Displays in the sidebar. You may need to scroll down to find it.
  3. Click Arrange.
  4. Drag the displays until their top edges are level.

On another operating system, open its display settings and line the monitors up the same way. Then move the mouse from each monitor to your other computer to check.

Lining the monitors up also changes where the mouse passes between those monitors, so it can differ from how they sit on your desk. It works because Synergy 1 and Synergy 3 treat all of one computer's monitors as one big screen: a monitor that sits lower than the edge facing your other computer isn't on the outer edge of that screen, so the mouse stops there, and once the monitors are level every one of them is on it.

Supported monitor arrangements

Uniform arrangements

As long as each computer's monitors are symmetrical (2x2, 4x4) or linear (2x1, 3x1, 4x1) and lined up along the edge that faces your other computer, Synergy 1 and Synergy 3 recognize them as one large screen, and the mouse movement between computers is seamless.

Arrange the computers in the layout the way they sit on your desk. The mouse moves from one computer to the next across the edge where they meet in the layout, so computers placed side by side are reached by moving the mouse left or right, and a computer placed above another by moving it up.

Where you arrange them depends on your product: Synergy 3 or Synergy 1

Non-uniform arrangements

If your monitors are of different sizes and you only want them to switch in specific areas, the setup depends on your product: Synergy 3 or Synergy 1

If your monitors sit at different heights and the mouse stops at some of them, see The mouse stops at some of my monitors above.

Sandwich arrangements

When one computer's monitors sit on both sides of another computer's monitor, use a screen wrap. For the steps, see: Creating a screen wrapping configuration

Unsupported monitor arrangements

Interlaced arrangements

Monitors from different computers interlaced with each other, beyond the sandwich arrangement above, aren't supported.

What follows depends on your product: Synergy 3 or Synergy 1

Synergy 3

Arranging the computers

Arrange the computers in Screen layout.

Set up a non-uniform arrangement

Set it up in Screen layout: drag each computer's screen into position and drag its edges or corners to resize it.

Synergy 1

Arranging the computers

Arrange the computers in Configure Server.

Set up a non-uniform arrangement

The grid in Configure Server can't make this kind of arrangement, so it needs a text config file with edge ranges. If you need help creating one, contact our support team.

For example, with Computer1 above Computer2 and Computer3, where the left half of Computer1's bottom edge leads to Computer2 and the right half leads to Computer3, the section: links of the config is:

section: links
    Computer1:
        down(0,50) = Computer2(0,100)
        down(50,100) = Computer3(0,100)

    Computer2:
        up(0,100) = Computer1(0,50)
        right(0,100) = Computer3(0,100)

    Computer3:
        up(0,100) = Computer1(50,100)
        left(0,100) = Computer2(0,100)
end

For how ranges work and how to load the file, see: Creating and using text config files

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