Android Screen In virtualbox Rotate 90 CCW?
There are some hotkeys listed for ICS, which hopefully still work with Kitkat:


  Rotating the screen: (to get that operate we must to have activated “Auto-rotate screen”)
  
  
  Press F12 two times in less than 2 seconds = Rotate 90º to the LEFT.
  Press F11  two times in less than 2 seconds = Rotate 90º to the RiGHT.
  Press F10 two times in less than 2 seconds = Rotate 180º.
  Press F9   two times in less than 2 seconds = Normal view 0/360º.
  


So I'd say try hitting F11 twice should solve your issue – after activating screen-rotation.