I've recently bought a Huawei P20 lite and whenever I watch series / videos ect in landscape mode, I can't respond directly to incoming messages in landscape format (preinstalled SwiftKey keyboard) because the keyboard has no enter button or this can't be set, I tried to load a new keyboard but it will not be recognized.
Just look for the keyboard in the settings or try another one (give it to you)
You have warranty. Submit. With a new software it runs.