Convert text using punctuation with a Japanese input source on Mac
After you set up a Japanese input source, you can convert text by typing a punctuation mark instead of using the Space bar.
On your Mac, switch to a Japanese input source.
Click the Input menu in the menu bar, choose Open Japanese - Kana Settings or Open Japanese - Romaji Settings, then Click Japanese - Kana or Japanese - Romaji in the sidebar.
Deselect Live Conversion if it’s selected, then select “Convert with punctuation.”
Click the Punctuation pop-up menu, then choose the pair of marks you want to use.
In your document, type a punctuation mark (such as 。or 、) to convert text, instead of pressing the Space bar. The punctuation mark is entered after the converted text.