Hi @Mark
First, I'd like to apologize for the frustration and inconvenience this change has caused.
To be honest, this is a user-to-user support forum, and moderators like us do not have direct visibility into Microsoft's product design decisions or access to tenant-specific engineering information.
To better understand what you're seeing, could you help clarify a few points?
- When did you first notice the change in the Shared tab experience?
- Are you a Teams owner/admin or a regular team member?
- Has Teams been updated recently on your device?
- Do other users in the same team see the same behavior, or is it only affecting you?
- Is this happening in all channels, or only specific channels?
- If you're a regular user, have you checked with your Microsoft 365 or Teams administrator to see whether any recent changes or updates were communicated to your organization?
Regarding the new Page tab and Loop functionality, those are part of Microsoft's ongoing Teams and Loop integration. Microsoft introduced Pages in Teams channels and has been rolling the feature out broadly over time, please refer this article: https://support.microsoft.com/en-US/teams/teams-channels/manage-pages-and-loop-components-in-channels
What is less clear from the available documentation is the navigation change you described in the Shared tab. I have not been able to find any Microsoft documentation that describes a setting designed to intentionally remove or restrict navigation back to the underlying SharePoint document library. Based on your description, I believe the Shared tab in your channel now looks something like this:

And you were expecting it to look more like this instead:

Interestingly, one of my teammates noticed a similar behavior where the navigation option disappeared, but then reappeared a few hours later without any obvious change. Because of that, I would also suggest a few basic checks:
- Sign out of Teams and sign back in.
- Test in Teams on the web.
- Test using a different browser.
- Compare the experience with another user, if possible.
I look forward to hearing what you find.
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