Hi @Justyna T,
Welcome to Microsoft Q&A forum.
Thank you for reaching out and providing your testing with us.
Based on your description, I understand how inconvenient it is when unread messages inside threads do not appear clearly at the channel level, especially when you rely on the bolded channel indicator to quickly identify new activity. After reviewing this behavior in the new threaded channel experience in Microsoft Teams, it is by design.
In the thread-based model, Teams intentionally separates channel-level and thread-level activity to keep the channel list more focused. The design goal is to avoid channels appearing unread every time an individual thread receives replies. As a result:
- Unread replies inside threads do not cause the channel name to appear in bold in the left navigation.
- “Mark as unread” applies only within the thread and does not escalate to the channel.
- Only Mentions, Followed Threads, and Activity feed items show bold indicators.
This is the expected behavior in the current Threads experience, and there is no available setting to change it.
To help make thread activity more visible, the following workarounds can improve discoverability:
- Follow the important threads so updates appear under Activity and in the Followed Threads view.
- Use Activity feed filters, such as Unread, Replies, or Mentions to quickly review new thread activity.
- Set the channel to “All activity” to increase how many signals you receive, even though the channel itself will not bold.
- Pin key channels so they remain easy to monitor when checking for updates.
I completely understand how helpful the bold channel indicator is for quickly spotting new activity, and why it feels less intuitive when thread replies don’t surface there. In the new threaded channel experience, Teams is designed to separate channel-level and thread-level activity to keep the channel list more focused. Because of this design approach, unread replies in threads don’t trigger the channel name to bold.
To make updates easier to notice, you can follow important threads so they appear in your Activity feed, use Activity filters like Unread or Replies to scan for new messages, pin key channels for quicker access, or set the channel to “All activity” to surface more signals. These options help ensure thread updates remain visible even though the channel indicator itself doesn’t change.
As a forum moderator, I hope you understand that I don’t have the ability to modify or escalate product issues directly. However, I strongly recommend submitting your feedback through the Microsoft Teams - Community Portal. This is the most effective way to ensure your voice reaches the product team and can be considered for future improvements.
Once you've submitted your feedback, feel free to share the link here in the comments. I’ll be happy to upvote it to help bring more visibility.
Additionally, since many other users have expressed similar concerns but may not know where to submit feedback, if my response has helped you better understand the situation and guided you toward a possible next step, please mark it as the “Accepted Answer.” Your action will help pin this post to the top, making it easier for others in the community who are experiencing the same issue to find your feedback and support it.
Thank you again for your time and for raising this important usability concern.
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