Beginning mid-June through mid-July, an optional feature to combine chats and channels in Microsoft Teams will be released. Once enabled, a self-guided onboarding flow will walk through the new layout and allow users to configure the view to their preferences.

Key features of this update include: 

• Unified chat and channel list
• Custom sections and favorites
• Improved filtering and @mentions view
• Streamlined message composition

Find additional info: New chat and channel experience (ITS support article) and Microsoft documentation