It can be hard to view a conversation when reading texts in the Messages app because the keyboard blocks half the screen.
To hide it, slide your finger down from above the text-entry box and the keyboard will start to disappear. Carry on until only the text-entry box is left. To make the keyboard reappear, tap the text-entry box and it will shoot right back up so text can be entered again.
The QuickType bar located above the keyboard can help you quickly complete words based on a smart predictive engine. However, if it’s getting in the way there is a way to hide it.
Open the Settings app, select General, then Keyboard. From here, turn off the Predictive option. The QuickType bar will now be hidden every time the keyboard is in use.