Samsung dual monitor setup with Windows or Mac

Extend these displays: This lets you use both monitors and have something different on each one. One of your monitors will need to be marked as your "main" display and will be the default monitor for most Windows functions. Just select the monitor and click the checkbox to mark it as the main one.

Duplicate these displays: When using this setting, everything that is shown on one monitor will appear on the other. If the monitors have different resolutions, then all monitors with a higher resolution will be lowered to match the resolution of the monitor with the lowest resolution.

Show only on: Use this to leave multiple monitors connected at once but toggle the one(s) you're currently using. The other monitors will stay powered on but only show black or not display a video signal at all. This can be used when connecting a laptop to a better monitor without using the laptop's built-in screen. In this case, make sure your laptop is not set to turn off when you close the lid, or it will turn off the external monitor.

Landscape: Use when the original bottom of the monitor is also the bottom of the displayed screen (this is the default setting). Use Landscape (Flipped) when the original bottom of the monitor is at the top of the displayed screen.

Portrait: Use when the original bottom of the monitor is on the left side of the displayed screen. Use Portrait (Flipped) when the original bottom of the monitor is at the right of the displayed screen.

Monitors do not have to be configured to line up exactly side by side; you can move them in any direction to reflect how they are arranged in real life. This is the case if monitors have different resolutions, since they will be different in size when arranging. After moving a monitor, click Apply and then test whether the monitors are lined up to your liking by moving your cursor from one screen to the other. The more the arrangement matches reality, the better and more natural it will feel to move from one monitor to the other.

Even if your monitors are physically far apart, they will need to be adjusted as if they were next to each other. This is because when moving from one monitor to another, there is no "space between," and your cursor immediately moves to the next monitor.

Extend the displays: Select Arrangement to use both monitors as separate displays. You can choose one monitor to be your main display for most functions.

Mirror the displays: You can select Arrangement to mirror the displays as well, so that everything on one monitor appears on the other. The monitor with a higher resolution will be lowered to match the resolution of the monitor with the lowest resolution.

You can also use these settings to set up more than two monitors. For instance, two monitors can use a mirrored display, and the third monitor can use an extended display.

You can also change the positions of the displays if you'd like. From the Arrangement tab, select one of the displays and then drag it to your desired position. You will see a red border as you move the display.