Under the default chat theme feature coming in WhatsApp, users will be able to choose a colorful background as well as set the brightness of that background according to their choice.

what is default chat theme feature which whatsapp is working on
Meta META-owned messaging app WhatsApp is now testing a new feature called Default Chat Theme.

WhatsApp makes necessary changes in the app interface from time to time to improve the experience of its users. Meta-owned messaging app WhatsApp is now testing a new feature called Default Chat Theme. Through this feature, users will be able to change the theme of their chat on WhatsApp. In the new update, WhatsApp is designing 11 default chat themes, which will give users more customization options.

WhatsApp New Feature: Default Chat Theme
Under the default chat theme feature coming to WhatsApp, users will be able to choose a colorful background as well as set the brightness of that background according to their choice. This is a default chat theme, so it will be automatically applied to all chats. Unlike Instagram, you will not be able to choose different themes for different chats. The company is preparing to roll out this feature for Android users soon.

WhatsApp New Feature: Community group chat visibility feature also coming
Meta-owned WhatsApp is also going to roll out the community group chat visibility feature for iOS users. This new feature strengthens the privacy of the community group admin. With its help, users can hide a particular group in the community group. With this new feature of WhatsApp, admins will be able to hide and unhide any group in their community group at any time.