Sorry to hear you have issues. You might be the first, nobody ever complained to me about that and I always use the cheats while testing, never had any problems. On PC and browser that's not a problem since you dont have the on screen text board so I assume you're on mobile. You can just press another GUI button like Load or Start or About and it will hide the keyboard, but I'll fix this next update.
EDIT: I made the text input and keyboard disappear when you input the correct password and that just leaves the normal cheats on display.
