Change your chat background & colors
You can use themes to customize your chat's background and colors in Allo for individual and group chats. Themes aren't available in a Google Assistant chat.
If you've recently downloaded or upgraded Allo, it could take a few hours for the app to enable the theme setting.
Change the theme
- On your Android phone, open the Allo chat where you want to change the theme.
- Tap the profile icon Chat or Group details Change chat theme.
- On the bottom of the screen, swipe through the themes until you find the one you want.
- Tap Apply.