The primary goal for Prison Architect UI management is Coordinate Alignment. When the UI scale is too high, mouse clicks often “offset” from the actual button positions. This configuration focuses on resetting the UiScale to a stable baseline and utilizing DPI Override to prevent Windows from interfering with the game’s internal rendering.
File Location
The preferences.txt file is stored in your local application data. Ensure the game is fully closed before making changes:
%LocalAppData%\Introversion\Prison Architect\preferences.txt
(Quick Tip: You can also find this by clicking “Open Save Folder” from the in-game Main Menu and going one level up.)
Technical Configuration (The 2026 “Clear-UI” Template)
Open the file with a text editor (Notepad or Notepad++). Locate the following lines and adjust them based on your resolution.
# Prison Architect UI Optimization - GameEngineer.net
# Target: Optimal 4K / 1440p Readability
ScreenW 3840
ScreenH 2160
ScreenWindowed false
ScreenMultiSampled true
UiScale 1.200000
# Note: 1.0 is default. Use 1.2 for 1440p, 1.5 for 4K.Parameter Breakdown:
- UiScale 1.200000: This is the most critical setting. If your UI is too small on a 1440p monitor, increasing this to
1.2or1.3provides a significant boost in readability. For 4K users,1.5is generally considered the “Goldilocks” zone. - ScreenMultiSampled true: Enables Anti-Aliasing on the UI elements themselves, preventing the “jagged text” look often seen when the UI is scaled up.
- ScreenW / ScreenH: Ensure these match your monitor’s native resolution exactly. Setting these to
0can sometimes force a “Borderless Windowed” mode that handles scaling better than the legacy Fullscreen.
Strategy for 2026 UI Stability
If your mouse cursor doesn’t line up with the buttons after changing the UI scale:
- The “DPI Scaling” Fix: Right-click
Prison Architect.exe> Properties > Compatibility > Change high DPI settings. Check the box for “Override high DPI scaling behavior” and set it to “Application.” This ensures thepreferences.txtvalues take priority over Windows’ automatic zooming. - The Keyboard Shortcuts: You can actually adjust the UI scale live while the game is running using Ctrl + and Ctrl – (use the keys next to Backspace, not the numpad). This writes directly to your
preferences.txtin real-time. - Safe Mode Recovery: If you set the
UiScaletoo high and can no longer see the menu to fix it, delete thepreferences.txtfile entirely. The game will generate a fresh one with default values on the next launch.
Key Performance Parameters
| Resolution | Recommended UiScale | Result |
| 1080p | 1.000000 | Standard, sharp UI. |
| 1440p | 1.200000 | Balanced text size and menu space. |
| 4K (2160p) | 1.500000 | Large, legible icons; reduces eye strain. |
| Ultrawide | 1.100000 | Minimal scale to keep the sidebar from hogging the screen. |
Frequently Asked Questions (FAQ)
Why does the UI look blurry when I increase the scale?
Prison Architect’s UI uses raster assets. When you scale past 1.5, the icons can start to lose sharpness. It is better to lower your game resolution to 1440p and keep the scale at 1.0 than to run 4K with a 2.0 scale.
I can’t find preferences.txt!
If the folder is empty, run the game once and change any setting (like volume) and close it. This forces the game to write the file to your %LocalAppData%.
Does UI scaling affect game performance?
Minimally. The main impact is on the CPU’s draw calls for the interface. In massive prisons (5,000+ prisoners), a very large UI can slightly reduce frame rates because the engine has more to render on the top layer.
Can I use a scale lower than 1.0?
Yes, you can go as low as 0.8 if you want a “minimalist” look, but be warned: the text in the “Reports” and “Grants” menus may become unreadable.
Conclusion and Expected Results
By manually setting the UiScale to 1.2 or 1.5 and disabling Windows DPI Scaling, you are taking full control of the game’s presentation. You can expect perfectly aligned mouse clicks, legible tooltips even in 4K, and a professional-looking interface that allows you to focus on managing your inmates rather than squinting at the menus.