Need help to disable Green Arrow/text box in top left corner while typing Japanese characters. "Finalize the string"?

[Syril Ram]

Hello,I am from the US and speak English (and trying to learn Japanese), but I have a Japanese kana keyboard (with English standard but Japanese IME also installed) and when I try to play certain Japanese games in Windows 10 that ask for me to type in Japanese with my kana keyboard, in the top left corner of the screen is a text input box showing the Japanese letters while I type and a Green Arrow. I don't know what this is, but I don't like it, it's very distracting. How do I disable or hide this?Below shows what happens when I right click the text input field.

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