14. Change the conversation background (and make dark mode even better)
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To make your WhatsApp chats interesting, you can change the chat wallpaper for everyone or for particular chats.
Go to Settings > Chat > Chat Wallpaper > Choose a New Wallpaper. If you want to change the dark mode wallpaper, switch to dark mode on iPhone or Android, and tap the “Choose Dark Mode Wallpaper” option instead.
Here, you can choose one of the built-in wallpapers, or you can choose any photo from your gallery.
Similarly, you can change the wallpaper for a particular chat. On your iPhone, open the conversation, tap the name from the top toolbar, and go to “Wallpaper & Sound.”
On Android, open the conversation, tap the three-dotted Menu button, and choose the “Wallpaper” option.