The primary goal for Stardew Valley multi-monitor optimization is Window-State Persistence. Many players face issues where the game launches on the wrong screen or minimizes when clicking on a second monitor. This configuration focuses on forcing Borderless Windowed mode (which is superior for multi-tasking) and manually defining the Window Position coordinates to bypass the OS’s default placement logic.
File Path
The startup_preferences file is an XML-based document found in your local AppData folder. It is separate from your save files.
%AppData%\StardewValley\startup_preferences
Technical Configuration (The 2026 “Clean-Launch” Template)
Open the file with a text editor. Look for these specific XML tags. If they are missing, the game will use default values; adding them manually will “hard-lock” your preferences.
<StartupPreferences>
<windowMode>1</windowMode> <fullscreen>false</fullscreen>
<preferredResolutionX>1920</preferredResolutionX>
<preferredResolutionY>1080</preferredResolutionY>
<forceCorrectAspectRatio>true</forceCorrectAspectRatio>
<uiScale>1.0</uiScale>
<zoomLevel>1.0</zoomLevel>
</StartupPreferences>Parameter Breakdown:
- windowMode=1: In 2026, Borderless Windowed is the gold standard for multi-monitor setups. It allows your mouse to travel seamlessly to your second screen (for the Stardew Wiki or Discord) without the game minimizing or “flickering.”
- preferredResolutionX/Y: Set these to the native resolution of your Primary monitor. Even if your second monitor is 4K, if you play on a 1080p screen, lock these values to 1920×1080 to prevent the engine from stretching the sprites.
- forceCorrectAspectRatio=true: Prevents the “Fat Sprite” syndrome. If you drag the window slightly between screens, this ensures the game maintains its internal 16:9 (or 21:9) ratio.
- uiScale / zoomLevel: If your monitors have different DPI settings (e.g., a 4K main and 1080p side), manually setting these to
1.0in the config ensures the UI doesn’t look massive or tiny when you first boot the game.
Strategy for 2026 Multi-Screen Productivity
- The “Cursor Lock” Trick: If you find your mouse accidentally clicking off-screen during combat in the Mines, enable “Lock Mouse to Window” in the in-game options. This works in tandem with the
windowMode=1setting to keep your inputs precise while allowing you to “Alt-Tab” out instantly. - DPI Scaling Fix: Right-click
Stardew Valley.exe> Properties > Compatibility > Change high DPI settings. Check “Override high DPI scaling behavior” and select “Application.” This prevents Windows from trying to “help” with the resolution, which is the #1 cause of the game launching on the wrong monitor. - Taskbar Behavior: If your taskbar stays visible over the game in Borderless mode, click the Taskbar once and then click back into the game. This re-prioritizes the Stardew window layer without needing a restart.
- Multi-Tasking Wiki View: For the best 2026 experience, keep the game on your primary 16:9 monitor and use your secondary monitor for the Stardew Valley Wiki or a Crop Profit Calculator. Borderless mode ensures the “Internal Clock” of the game doesn’t pause when you’re looking up a villager’s favorite gift.
Key Setup Parameters
| Parameter | Recommended Value | Impact |
| Window Mode | Borderless (1) | Smooth transitions between monitors. |
| Fullscreen | False | Prevents the game from minimizing when Alt-Tabbing. |
| Zoom Level | 0.75 – 1.25 | Customizes the field of view for large farms. |
| DPI Override | Application | Stops Windows from “stretching” the game window. |
Frequently Asked Questions (FAQ)
Why does the game keep launching on my side monitor?
Stardew Valley often remembers the last position it was closed in. To fix this, move the game to your primary monitor, enter the startup_preferences file, and ensure your preferredResolution matches your main screen before saving.
Can I play in Split-Screen across two monitors?
Yes! By using Borderless mode and stretching the window across both screens, you can effectively give each player their own monitor for local co-op. You may need to adjust the preferredResolutionX to double your width (e.g., 3840).
Does multi-monitor setup cause lag?
On 2026 hardware, no. Stardew is a very “light” game. However, ensure your monitors are plugged into the same GPU to avoid “cross-bus” latency which can cause minor stuttering.
My “startup_preferences” file is empty!
This is normal if you haven’t changed any settings yet. You can manually paste the template above into the file, and the game will recognize the parameters on the next launch.
Conclusion and Expected Results
By forcing windowMode=1 and defining your Native Resolution in the startup_preferences, you are eliminating the friction of a multi-monitor setup. You can expect instant Alt-Tabbing, perfectly scaled UI elements, and a stable window position that stays exactly where you want it every time you return to Pelican Town.