Huawei
Change SwiftKey Keyboard Theme auf Huawei
Huawei phones ship SwiftKey with a plain gray background by default. This affects only the visual style of the keyboard: background color, key color and, with some themes, gradients or patterns. Layout, key size and typing behavior stay the same regardless of theme.
The theme setting lives inside the keyboard app itself, not in the general display settings, which is why many people never find it. To change it, open Open the settings ➔ Tap on System & updates ➔ Tap on Language & input ➔ Tap on SwiftKey Keyboard ➔ Tap on Themes. From the theme list, tap Choose a Theme, then Tap on Download to fetch it, and follow the instructions on the display to apply it.
Some themes need to download extra assets before they activate, so a short wait after tapping Download is normal. If the keyboard still shows the old colors afterward, reopen any text field to force SwiftKey to reload the active theme.
If you are looking to change the keyboard layout, key size, or switch input languages instead of colors, that is handled in a different section of Language & input and is not covered by the theme option.