Unwanted cursor highlighting in Writer

I saw maybe one other person posting about this, what looks like last year. However, the discussion is closed so I can’t even read the help response. I am trying to place my cursor somewhere specific to do some editing, but it will highlight the entire letter/space next to the cursor, and replaces what I already have typed with the edit entirely. This feature is driving me absolutely insane! I don’t want to have to retype an entire sentence when I want to add one word or letter to the middle of it.

I use Libre 7.6.6, is there any way to turn this off?

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