Guides
How to change the main display (primary monitor) in Windows
The primary monitor, which Windows calls the main display, is the screen with the taskbar clock and system tray, where notifications pop up, and where most apps and games open by default. When the laptop screen ends up as the main display at your desk, or a TV takes over after you plug it in, everything opens in the wrong place. Here is how to change it in Windows settings, what it affects, and how to switch it in one click or automatically.
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Change it in Windows settings
Open Settings, System, Display. Click Identify to see which number appears on which screen, then select the monitor you want at the top of the page. On Windows 11, expand Multiple displays and tick Make this my main display; on Windows 10, scroll down and tick the same checkbox. The option is greyed out on the monitor that is already the main display. The change applies immediately: the taskbar clock and tray move, and the desktop icons usually follow.
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Know what the main display controls
The main display holds the clock, tray icons and notifications, and it is the default home for new windows that do not remember their own position. Many full-screen games start on it, and the sign-in screen appears there. It does not have to be the leftmost monitor: the arrangement in Display settings decides where the screens sit, while the main display flag only decides which one is primary. If you want taskbars on every screen, turn on Show my taskbar on all displays under Personalization, Taskbar, Taskbar behaviors.
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Switch it in one click with WindowLayout
Install WindowLayout and open the Monitors page, which shows every monitor as it sits on your desk. Select the screen you want, choose Make this my main display and press Apply. WindowLayout lets you line up several changes first, such as the arrangement, resolution and main display, and apply them together. You then have 15 seconds to keep them; otherwise they are undone on their own, just like in Windows. Ctrl+Alt+I flashes the monitor numbers so you know which screen is which.
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Save display profiles for different main screens
If you switch between setups, for example gaming on the TV and working at the desk, set the main display, resolution and refresh rate for one setup and click Save current under Display profiles on the Profiles page, or Save as profile… on the Monitors page. Repeat for the other setup. A display profile stores the arrangement, resolution, refresh rate, orientation and main display of every screen, and WindowLayout lets you include whether each monitor is on, its scaling and HDR. Apply it from the Profiles page, the tray menu or the command palette (Ctrl+Alt+Space).
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Set the primary monitor automatically when you dock
Laptops often promote the built-in screen to main display after undocking and keep it that way when you dock again. Open Triggers, click Add trigger, choose A monitor is connected and the action Apply display profile with your desk profile. When the external monitors come back, the profile makes the right screen primary and sets its resolution and refresh rate. Add a second trigger with Restore window profile to put your windows back on the screens too.
Frequently asked questions
Why is Make this my main display greyed out?
Either that monitor is already the main display, or the screens are set to Duplicate instead of Extend. Press Win+P, choose Extend and try again.
Will my windows move when I change the primary monitor?
Usually only the taskbar items and desktop icons move, but some apps reposition their windows. Save a window profile before switching and restore it afterwards if anything shifts.
Does a game always open on the primary monitor?
Many do, especially in exclusive full screen. Most games also have a monitor or display option in their video settings, which is the most reliable way to choose a screen.