Pre-Submission Checklist

• I have checked the existing/closed issues to ensure this issue has not already been reported.
• I am using the latest supported version of the browser.
• I have tried disabling all browser extensions/add-ons to rule out interference from these.
• I have tried clearing the browser cache and cookies.
• I have checked with a new profile and the issue still occurs.
• I have provided detailed step-by-step instructions on how to reproduce the issue.
• I have included relevant screenshots or console outputs.
• I have checked that this problem is not occurring in the latest version of Firefox.
• This issue is specific to this browser and does not occur in other browsers.

Bug Summary

Congrats on the release of version 12.1!
I tried to work on the small rectangle of Sidebar too long, so the ability to have it in main window/popup is really helping me!
However, there's a bug : it does not follow container.
If the sidebar page is in the container Personal, popup will stay in that container, but open in main window will not.
That means if my normal Microsoft account is my work one, and the one in Personal container is my personal email, then doing "Open in Main Browser" will take me from my personal email in sidebar to my work email in main window. The intended behavior would be to take me to my personal email in the main window (tab with personal container)
Thank you!!
JF

Reproduction Steps

1. Create a sidebar panel with a container
2. Notice the sidebar icon have a colored line (color depending on container)
3. Open that sidebar
4. Click the new "Open in Main Browser" icon, just left of the X button.
5. Notice a new tab open in the main browser, but that tab does not have a colored line. This tab has no container.

Expected Behavior

The newly created tab in the main window should have a colored line, indicating it's in the same container of the sidebar panel we're coming from.

Actual Behavior

The newly created tab in the main window does not have a colored line, indicating its using no container.

Screenshots

Browser Version

12.1.2

Operating System

Windows 11

Additional Context

No response