Hmmm... that's strange. I just tried Ctrl+C and it toggles Compact Mode just fine. I am using an N810 - so maybe it's something with the on screen keyboard?
Perhaps check setting in Control Center-> Accessibility -> make sure Sticky Keys is activated. This ensures that you can tap Ctrl and then C; instead of having to press both at once.
Thank you everyone,i think the sticky key is already actived since ctrl+f works fine for full screen mode.
After deleting the setting file,i got the full mode back.
