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Use Private Mode for a Japanese input method on Mac
After you set up a Japanese input source, you can use Private mode to prevent your Mac from “learning” the candidate selections you choose as you enter Japanese text. It also prevents specific user information (such as addresses from Contacts) from being used in Japanese conversion.
On your Mac, switch to a Japanese input source.
Click the Input menu in the menu bar, then choose Private Mode (so that a checkmark appears next to it in the menu).