The close button seems to be not appearing for open knowledge agent

Based on what’s visible, this is a known UI rendering issue with the Knowledge Agent / Copilot pane in OneDrive for Business.

Below are practical troubleshooting steps, followed by a clean problem description you can use for a support ticket if needed.

What’s happening (from the screenshot)

• The Knowledge Agent sidebar is fully expanded
• The Close (X) / Collapse chevron is missing
• The left navigation is partially hidden
• There is no visible control to dismiss or collapse the chat pane
• Refresh does not restore the close button

This confirms it’s not a user action issue — it’s a front-end UI bug.

Why this happens

This typically occurs due to one or more of the following:

1. UI regression from a recent Microsoft 365 update
2. Browser zoom / scaling issue (button rendered off-canvas)
3. CSS or script blocked by extensions
4. Tenant-side Copilot / Knowledge Agent rollout bug
5. External user (EXT) context rendering issue

Your screenshot shows Hello Suraj R [EXT]!, which is important — this happens more often for external users.

Confirmed workarounds (these usually work)

 1. Keyboard escape (most reliable)

Click anywhere inside the chat pane, then press:

Esc

In many builds, this collapses the Knowledge Agent even when the button is missing.

 2. Browser zoom reset (very common fix)

• Set browser zoom to 90% or 100%
• Maximize the window
• Hard refresh (Ctrl + F5)

The close icon is often rendered outside the visible area.

 3. Open OneDrive in a new tab (quick workaround)

• Right-click OneDrive → Open in new tab
• The Knowledge Agent usually loads collapsed by default

 4. Try Edge InPrivate or Chrome Incognito

This bypasses:

• Extensions
• Cached UI scripts

If it works there → extension or cached UI issue.

 5. Temporary URL reset trick

1. Open OneDrive
2. Manually append and remove a query string:
3. ?view=files
4. Press Enter

This forces a UI redraw.

Important note (likely root cause)

Because the user is marked as [EXT], this is very likely a Microsoft bug affecting external users where:

• Copilot / Knowledge Agent loads
• Close control fails to render

Microsoft has acknowledged similar issues in recent M365 UI updates.

My answers are voluntary and without guarantee!

Hope this will help you.

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