Android
To change the color for a contact:
- Open the chat with your contact.
- Tap the contact name or header to view chat settings.
- Tap Color and pick a color.
To change the theme:
- In Signal, tap your profile
> Appearance > Theme. - Pick System, Light or Dark.
iOS
To change the theme:
iOS 13 & iOS 14
- In Signal, tap your profile > Appearance.
- Pick System, Light, or Dark.
iOS 11 & iOS 12
- In Signal, tap your profile to view Signal Settings.
- Tap the moon icon
in the top-right corner.
Desktop
To change the theme:
- In Signal, tap your profile >
Preferences... - Under Theme, pick System, Light, or Dark.