1. F5 toggles between the current language and the one that was used when the keyboard was first plugged in. 2. F6 toggles between the current font and the one that was used when the keyboard was first plugged in. 3. F7 toggles between the current font size and the one that was used when the keyboard was first plugged in. 4. F8 toggles between the current font style and the one that was used when the keyboard was first plugged in. 5. F9 toggles between the current font color and the one that was used when the keyboard was first plugged in. 6. F10 toggles between the current font style and the one that was used when the keyboard was first plugged in.