hey guys i'm trying to make an app in python that shows the viewfinder in fullscreen but it stays always like this

i tried to set it in fullscreen
Code:
camera.start_finder(size = (176,208))
but it shows it something like 176x144 not 176x208 do i need to rotate the whole canvas to be in landscape mode because when i try
Code:
appuifw.app.orientation = 'landscape'
it doesn't change it in landscape mode