Can't type Password

Wait 5 sec.

I'm new to this. I downloaded Mob Control. I followed the instruction and activated draw over apps. But when I need to login. I can type the account name, but not the password. The keyboard appears for a blink and disappears. Even if I try to make new account through the game login part. The password can't be typed in. I'm using a Huawei P40 and have Gbox.