No RCS, no problem: Chat themes in Messages are now available for standard texts

A recent Google Messages update appears to have enabled Chat theme for all chats in the app, while being previously limited to RCS chats.
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How to enable, disable, and use RCS chat in Google Messages

Since Google's push to RCS standards in 2019, Android's Messages app by Google offers great in-house features. After you've opened Google Messages and enabled RCS chats, you'll find typing indicators, ...
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Google Messages Introduces Chat Customization and Updated Gestures

Discover how Google Messages’ new chat customization and updated gestures transform your messaging experience with enhanced ...

For those worried that their chat messages might seem cold: 3 writing tips you'll regret not knowing

Honestly, don't you reread your chat messages three times before sending them? You might even spend 10 minutes wondering, ...