Windows 無法使用 Crtl+Shift 切換輸入法

Start -> Run -> regedit

HKEY_CURRENT_USER\Keyboard Layout\Toggle

Language Hotkey = 1

Value		Meaning
1		Key Sequence for Toggle enabled: LEFT ALT+SHIFT is set (standard value)
2		Key Sequence for Toggle enabled: CTRL+SHIFT.
3		Key Sequences disabled.
4		When default locale is Thai the accent grave key is set for toggle, otherwise it’s disabled.

Reference :
How-to add Keyboard layouts to the language bar. | RES Software Blog