Kindly reset factory data with backup then try to it's again. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
As per your concern, we would request you to kindly perform the following steps.
Kindly activate the option by using the mentioned settings: General Management > keyboard List and default >Turn ON the keyboard button and navigation bar.
Alternatively, you can see the option on the Samsung keyboard: Open keyboard > long press on the option on the left side. However, If you have other concerns regarding Samsung products kindly feel free to get in touch with us.
