I downloaded g board to test it and it was nice but I wanted to switch back, so I deleted the app and then my keyboard changed to the default keyboard without the colors and theme of my other one. This was fine but the layout was different. Firstly my space bar was smaller and my dot wasn't on the main part. And then my numbers weren't on the top of my keyboard. I tried anvling it in settings but it didn't work and I even tried 3rd party apps like keys cafe and goodlock but to no avail. The settings app and online tutorials don't work and I am stuck with a bad keyboard.
Have you tried you to change the theme and change back to see if it will apply it again if bot try going in to Samsung keyboard settings and reset to default settings then try aging 😅