Startup parameters

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

<program file> -popupwindow -adapter 2

For Steam version:

Change default to run in 64bit (Windows):

Properties -> General -> Set Launch Options...
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. ^[1]
`-single-instance`	Only allows one instance of KSP. When attempting to launch another instance of KSP, existing instance will become active window. ^[2]
~~`-adapter`~~	~~Changes preferred monitor for full screen or full screen window. Example: "`-adapter 2`"~~ ^[3]
`-monitor`	Changes preferred monitor for full screen or full screen window. Example: "`-monitor 2`" ^[4]
`-force-opengl`	Forces KSP to use OpenGL ^[5]
`-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.
`-force-d3d9`	Forces KSP to use DirectX9 ^[2]
`-force-d3d11`	Forces KSP to use DirectX11
`-force-gfx-metal`	Forces KSP to use the Mac OS Metal API
`-force-vulkan`	Forces KSP to use the experimental Vulkan stack.
`-force-wayland`	Forces KSP to use the experimental Wayland support in Linux.
`-nolog` ^[2]