How do I stop FSX looking stretched on a widescreen monitor?

To stop FSX or FSX: Steam Edition looking stretched on a widescreen monitor, select the monitor’s native resolution in Windows and FSX, then set WideViewAspect=True in fsx.cfg. Native resolution keeps circles round; WideViewAspect corrects cockpit framing for 16:9, 16:10 and ultrawide displays.

How to make a widescreen monitor not look stretched in FSX

The dependable fix is to correct the pixel geometry first, then adjust FSX’s field of view.

1. Find the monitor’s native resolution. Open Windows display settings and note the resolution marked Recommended. Common examples include 1920 × 1080, 2560 × 1440 and 3440 × 1440, but use the value specified for your monitor rather than choosing by example.
2. Select the same resolution in FSX. Open the simulator’s display settings, select the graphics options and choose the matching full-screen resolution. Our guide to choosing the correct FSX resolution and graphics settings explains which settings affect sharpness, aspect ratio and performance.
3. Compare windowed and full-screen modes. Press Alt+Enter. If the picture is correct in a window but stretched in full screen, the fault is usually the selected full-screen mode, graphics-driver scaling or the monitor’s aspect setting. See how to compare FSX windowed and full-screen behaviour without changing unrelated settings.
4. Close FSX and locate the active configuration file. Boxed FSX normally uses %APPDATA%\Microsoft\FSX\fsx.cfg. FSX: Steam Edition may use that location or %APPDATA%\Microsoft\FSX-SE\fsx.cfg, especially when it coexists with boxed FSX. If both exist, the file modified when your edition last closed is normally the active one.
5. Enable widescreen field-of-view handling. Back up fsx.cfg, open it in a plain-text editor and find the existing [Display] section. Change or add WideViewAspect=True. Add it only once, do not create a second [Display] section, and make sure the editor has not produced a file named fsx.cfg.txt.
6. Stop the GPU or monitor stretching lower resolutions. If you cannot run FSX at native resolution, select a scaling mode named Aspect ratio, Preserve aspect ratio, Original or 1:1 rather than Full screen or Stretch. The wording varies by graphics driver and monitor. Black bars are preferable to distorted instruments.
7. Restart FSX and inspect a round gauge. A genuinely round instrument confirms that geometric stretching is fixed. If the gauge is round but the cockpit feels too large, too small or too close, adjust that view’s zoom rather than changing resolution again.

What does WideViewAspect=True actually change?

WideViewAspect=True changes the way FSX frames its 3D views; it does not alter the rendered resolution or make an oval image round.

Without suitable widescreen handling, the virtual cockpit can appear cropped or excessively zoomed even when every object has the correct shape. Enabling the setting gives 16:9, 16:10 and wider displays a more appropriate field of view. The numerical zoom value may then produce different framing, so set WideViewAspect=True before fine-tuning cockpit zoom.

Resolution and field of view therefore solve separate faults. Native resolution corrects pixel geometry, while WideViewAspect=True corrects 3D cockpit and outside-view framing.

Which symptom identifies the real scaling problem?

Oval gauges indicate image stretching; round gauges in a badly framed cockpit indicate a field-of-view, zoom or panel-design problem.

What FSX screen size and resolution should I use?

FSX has no preferred physical monitor size; the correct display size is the monitor’s native pixel resolution.

A 24-inch and a 32-inch monitor can both use 1920 × 1080, so diagonal size does not determine the FSX setting. In full-screen mode, match the native resolution exactly. In windowed mode, FSX occupies the usable desktop area inside its borders, so the rendered area will be slightly smaller even when the window is maximised.

Windows text scaling at 125% or 150% is also separate from screen resolution. It changes the apparent size of menus and windows, but it should not be used to correct stretched 3D graphics. If “FSX size” means its installed disk footprint instead, these display changes have no effect on storage use; the total varies substantially with the edition, scenery, aircraft and other add-ons installed.

How should cockpit scaling be corrected?

Cockpit scaling should be corrected according to whether the problem affects the 3D virtual cockpit or a legacy 2D panel.

Virtual cockpit size and zoom

In the virtual cockpit, use native resolution and WideViewAspect=True first. If instruments remain round but seem too large, increase the zoom value slightly to narrow the field of view; if the view is too tight, reduce it cautiously. Excessively low zoom values can make the cockpit centre look distant while exaggerating objects near the edges.

An off-centre view is not an aspect-ratio fault. Reset the active view or eyepoint and check whether the saved flight, aircraft or a camera add-on is loading a customised position.

Legacy 2D cockpit panels

A legacy 2D panel may use fixed artwork and dimensions created for a 4:3 screen. WideViewAspect=True affects 3D view framing, not the proportions of that bitmap.

If only one aircraft’s 2D panel is distorted or oversized, changing the global FSX resolution usually creates more problems than it solves. Use that aircraft’s virtual cockpit, resize the panel where its design permits, or install a panel specifically designed for widescreen use.

Why does the widescreen centre look right while the edges look stretched?

On an ultrawide monitor, a correct centre with stretched-looking edges is usually projection distortion rather than incorrect scaling.

FSX projects one flat 3D camera view across the full width of the screen. At very wide aspect ratios, objects near the edges are shown at a steep viewing angle and can appear elongated even though round instruments in the centre remain round. Increasing cockpit zoom slightly narrows the field of view and reduces this effect, at the cost of showing less peripheral scenery.

Multiple separately framed views can give better geometry across several physical monitors, but they demand more processing power and configuration. Our advice on setting up an ultrawide flight-simulation display covers viewing distance, field of view and edge distortion in more detail.

Why is a GSX window too big when Windows scaling is set as 125%?

An oversized GSX or other add-on window is normally a Windows DPI-scaling problem, not something WideViewAspect=True can fix.

1. Test Windows scaling at 100%. Change only the Scale setting, then close and reopen FSX and the add-on. Do not change the monitor away from its native resolution.
2. Confirm whether DPI scaling caused it. If the window fits at 100% but is too large at 125% or 150%, restore your preferred setting and check the compatibility properties of the executable that owns the window.
3. Try the high-DPI override only for the affected program. Under its Compatibility properties, open the high-DPI settings and test an override performed by Application. This can make a legacy window smaller and sharper, although text may become too small. Undo the override if it makes the interface less usable.
4. Use the add-on’s own interface scaling option when available. GSX editions and companion applications do not all handle DPI in the same way, so an override applied to fsx.exe may not affect a window owned by a separate process.

These steps apply to GSX used with FSX or FSX: Steam Edition. A GSX version running under a different simulator is not controlled by FSX’s resolution or fsx.cfg.

I changed both settings and it still did not work

If native resolution and WideViewAspect=True made no difference, verify that FSX is reading the file and display mode you actually changed.

• Check the active configuration file. FSX: Steam Edition can use either the FSX or FSX-SE roaming folder. Compare modification times after closing the simulator.
• Edit only while FSX is closed. If the simulator is running, it may overwrite your change when it exits.
• Look for duplicates. Keep one WideViewAspect entry under one [Display] section. Conflicting entries make diagnosis unreliable.
• Expose file extensions in Windows. A file displayed as fsx.cfg may really be fsx.cfg.txt.
• Test a fresh configuration carefully. Back up and rename the active fsx.cfg, then start FSX so it creates a new one. This resets customised graphics and control-related configuration, so use the test to diagnose the fault rather than deleting the backup.
• Check whether the entire Windows desktop is stretched. If circles and photographs are distorted outside FSX, correct the Windows resolution, graphics-driver scaling and monitor aspect mode first.
• Isolate full-screen faults. If stretching occurs only after pressing Alt+Enter, use our Windows 10 and 11 full-screen troubleshooting steps to check resolution matching and compatibility behaviour.
• Test a default aircraft. If only one add-on aircraft is affected, its panel or saved camera definitions are the likely cause. Reinstalling FSX or repeatedly changing global resolution will not repair fixed 2D artwork.