Synchronize user dictionary:
This is for IMEs. By selecting this,
the words you have entered and the associated source strings will be saved
and synchronized on Google’s server as your personal dictionary. It
will be used to improve the conversion accuracy. If you uncheck this, we will
stop saving your input on Google’s server. Note that your personal
dictionary that has been stored on Google’s server will not be
cleared if you uncheck this option.
Show on-screen keyboard:
If you select a virtual keyboard, you can
show or hide the on-screen keyboard by this option. But you can input
native script without looking the keyboard layout.
Show status bar:
Status bar is the small floating window used by
Chinese Pinyin, Wubi, Cangjie, Zhuyin, and Cantonese IMEs to switch
Chinese/English mode, Chinese/English punctuations, and
full-wdith/half-width alphanumeric. You will see it when you have
selected one of these IMEs.