Fixing Fullscreen / Borderless Mode in Meccha Chameleon

Display configuration errors in Meccha Chameleon—such as failing to enter Exclusive Fullscreen mode, borderless windows displaying black bars, or the cursor drifting onto secondary monitors—typically stem from Windows display scaling conflicts, overlay hooks, or DirectX swap chain crashes.

Because hiders rely on precise mouse movements and sharp focus for real-time camouflage, display issues like input lag in borderless mode or screen stuttering can directly impact your match performance.

Follow this troubleshooting guide to optimize your display configuration.

Display Mode Trade-Off Comparison

Understanding the benefits and limitations of each display mode helps you select the correct settings for your setup.

Fullscreen Troubleshooting Decision Tree

Follow this diagnostic tree to locate display configuration errors:

                     [Display Mode Mode Issue]
                                |
                    Check Window Mode Behavior
                  What happens on toggling mode?
                   /            |            \
           (Black Screen) (Wrong Resolution) (Reverts to Window)
            /                   |                  \
     Disable Overlays      Verify DPI Scaling   Disable Win Optimizations
     [Check driver updates] [Match Native Res]   [Apply Steam launch flags]

• Branch A: Black Screen or Crash: Swapping modes freezes the screen. Jump to Overlay and Driver Conflict Fixes.
• Branch B: Mismatched Resolutions: Black borders appear around the game window, or UI elements align incorrectly. Jump to DPI Scaling and Resolution Settings.
• Branch C: Mode Reversion: The game immediately reverts to windowed mode after selecting fullscreen. Jump to Windows Compatibility and Launch Flags.

Detailed Step-by-Step Fixes

1. Disable Windows Fullscreen Optimizations (Compatibility Fix)

Windows Fullscreen Optimizations can intercept Unreal Engine 5’s exclusive fullscreen requests, forcing the game into a borderless wrapper that triggers resolution mismatches.

1. Open your Steam Library.
2. Right-click Meccha Chameleon, select Manage > Browse local files.
3. Navigate to: Binaries\Win64\
4. Right-click MecchaChameleon-Win64-Shipping.exe and select Properties.
5. Navigate to the Compatibility tab.
6. Check Disable fullscreen optimizations.
7. Click Apply and then OK.
8. If the game crashes on launch after this change, refer to our Alt-Tab Crash Guide.

2. Configure DPI Scaling Settings (DPI Resolution Fix)

High DPI monitors (1440p and 4K) often use Windows display scaling (e.g. 150%). This scaling can cause the game to render at a blurry resolution or display black borders in borderless mode.

1. Open the properties window for MecchaChameleon-Win64-Shipping.exe again.
2. Under the Compatibility tab, click Change high DPI settings.
3. Check Override high DPI scaling behavior.
4. Set the drop-down menu for Scaling performed by: to Application.
5. Click OK to apply. This forces the game to render at your screen’s actual pixel dimensions. For blurry visual adjustments, see the Resolution Scaling Blurry Fix.

3. Edit Configuration Files Manually (INI Configuration Overrides)

If the game refuses to save your settings or boots into an unplayable windowed size, you can manually override the configuration values in the game’s initialization directory.

1. Close Meccha Chameleon and exit the Steam client.
2. Press the Windows Key + R to open the Windows Run dialog.
3. Type the following path and click OK: %LOCALAPPDATA%\Chameleon\Saved\Config\WindowsNoEditor\ (Note: If the folder does not exist, check %LOCALAPPDATA%\MecchaChameleon\Saved\Config\WindowsNoEditor\)
4. Locate the file named GameUserSettings.ini and open it in Notepad or any plain text editor.
5. Find the following lines and modify them to match your targeted settings:

   FullscreenMode=1
   LastGPUPreferredFullscreenMode=1
   PreferredFullscreenMode=1

   • Value Meanings: 0 represents Exclusive Fullscreen; 1 represents Borderless Windowed; 2 represents Windowed Mode.
6. Locate the resolution parameters to match your native screen dimensions (e.g. 1920x1080):

   ResolutionSizeX=1920
   ResolutionSizeY=1080
   LastUserConfirmedResolutionSizeX=1920
   LastUserConfirmedResolutionSizeY=1080

7. Save the file and set it to Read-Only in properties if the game attempts to overwrite it on launch.

4. Apply Force Launch Flags (Launch Options Fix)

When the in-game menus fail to save your display preferences, you can bypass the settings menu using Steam’s launch parameters.

1. Open Steam. Right-click the game and select Properties.
2. Under the General tab, scroll to Launch Options.
3. Add the appropriate flag for your desired mode:
   • To force borderless windowed: -borderless
   • To force exclusive fullscreen: -fullscreen
   • To force windowed at native dimensions: -windowed -w 1920 -h 1080 (replace with your monitor’s native dimensions).
4. Close properties and launch the game.

5. Resolve System Overlay Conflicts

Active screen overlays hook into the graphics pipeline, which can block display mode swaps.

1. Discord: Open Discord Settings > Game Overlay > Toggle Enable in-game overlay to OFF.
2. GeForce Experience / AMD Software: Open settings and disable the in-game overlay features.
3. Steam Overlay: If problems persist, try disabling the Steam overlay under the game properties. For resolving overlay hooks, consult our Screen Tearing Guide and Low FPS After Update Guide.