Many games use the Shift and Num Lock keys for control. In Kerbal Space Program Shift increases the throttle.
On Windows, when you press the Shift key five times, the OS interrupts the game display and switches to a prompt asking if you want to turn on Sticky Keys.
Pressing the Num Lock key for five seconds enables sound when you press the Caps Lock, Num Lock, or Scroll Lock.
Pressing the right Shift key for eight seconds turns on the Filter Keys functionality.
To disable the Sticky Keys, Toggle Keys, and Filter Keys prompts
- Open Settings
- On the Keyboard page uncheck
- Allow the shortcut key to start Sticky Keys
- Allow the shortcut key to start Toggle Keys
- Allow the shortcut key to start Filter Keys