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How to set SMS in Redmi and how to save it for a long time?

The volume in the sound setting is turned off, but as long as there are text input, QQ information input, WeChat chat input and so on, you can write short messages. Just click on a letter and a nasty "good" sound will pop up. It's not big, but it's annoying. How can I get rid of it?

Not a few days ago, but this happened after being played by children several times in the past two days.