I found it; open the text message from that contact, then click the three dots in the upper right side of the screen, then choose notification sound, then choose RESET on the upper right.
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open the text message from that contact, then click the three dots in the upper right side of the screen, then choose notification sound, then choose default sound.
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I can help. While you have the keyboard open click on the gear icon (setttings), then scroll down to "Swipe, Touch and Feedback", then "backspace speed".
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