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please press your
CTRL+SHIFT+LEFT keys to return it back to original condition.
if you still have problems, please let me know.
if that didn't work, please try this:
CTRL+ALT+RIGHT ARROW keys
on asus computers, this will rotate the screen by 90 degrees.
can you try this:
did you try to press that button several times?
Ctrl + Alt + Right
(if right does not work please try up and down arrows)