Startup parameters

Startup parameters can be configured by creating a new shortcut and then adding the appropriate option in the target line.

Example

<program file> -popupwindow -adapter 2

For Steam version:

1. Choose the game shortcut in Library
2. Right click on the game
3. Properties -> General -> Set Launch Options...

Change default to run in 64bit (Windows):

1. Properties -> General -> Set Launch Options...
2. Change default executable to the 64bit version: "<path to KSP directory>\KSP_x64.exe" %command%

ex. "C:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\KSP_x64.exe" %command%

Parameters

Here is an incomplete list of available start up parameters:

-popupwindow	Enables full screen window mode. "Full Screen" option in graphics settings must be disabled for this to work. This option is also available through the KSP launcher settings.
-single-instance	Only allows one instance of KSP. When attempting to launch another instance of KSP, existing instance will become active window.
-adapter	Changes preferred monitor for full screen or full screen window. Example: "-adapter 2"
-force-opengl	Forces KSP to use OpenGL
-force-glcore	Forces KSP to use OpenGL and use a core profile (default behavior in OpenGL)
-force-gles	Forces KSP to use the OpenGL ES stack typically used in mobile Unity Games. Warning: This is not tested with KSP.
-force-d3d9	Forces KSP to use DirectX9
-force-d3d11	Forces KSP to use DirectX11
-force-vulkan	Forces KSP to use the experimental Vulkan stack. Warning: This is not tested with KSP
-force-wayland	Forces KSP to use the experimental Wayland support in Linux. Warning: This is not tested with KSP
-nolog

External Links

• The Power of Unity's Command Lines arguments - KSP Forum
• Unity - Manual: Command line arguments