Microsoft Quietly Brings Back the Copilot Sidebar It Killed in 2024

Microsoft has quietly added a docking option to the Copilot app on Windows 11 that pins the assistant to the left or right edge of the screen and reflows every open window to fit the leftover space. The change was spotted on May 24, 2026 in a gradual rollout that arrived through a drop-down menu in the Copilot title bar rather than a public changelog entry.

The new layout returns Copilot to almost exactly the sidebar shape Microsoft retired in February 2024, after promising a less intrusive AI experience. The mechanics are familiar, the wrapper around them is not.

How the Title-Bar Drop-Down Reshapes the Desktop

Default behavior is unchanged. Tap the Copilot icon on the taskbar and the app still opens as a standalone floating window over the desktop, the way Microsoft has shipped it since the WinUI-to-web swap earlier this year.

The change lives one click deeper. A new drop-down menu sits inside the Copilot title bar, separate from the native Snap Layouts that Windows 11 already offers for ordinary application windows. Hovering on the menu exposes four layout choices.

When the dock option is on, the rest of the desktop reflows around the Copilot panel. Windows Latest tested it against a maximized File Explorer window and found Explorer resized itself to leave the docked column intact. Desktop icons follow, sliding toward the open side so they sit clear of the assistant.

The behavior differs from the 2023 sidebar in one practical sense. Back then users got a fixed sidebar on one side, no choice in placement, and no easy switch to a floating window. The new menu gives a per-session pick: left, right, picture-in-picture, or out of the way entirely. Documentation for the feature has not been published; users see the menu only after the server-side flight reaches their device.

A Two-Year Loop Back to the 2023 Sidebar

Copilot has been through six distinct UI treatments on Windows 11 in under twenty months. The first version was a fixed sidebar that shipped with the Windows 11 23H2 update in September 2023, deeply tied to the operating system and able to change settings or launch apps from a single pane.

In February 2024 Microsoft tore that sidebar down and rebuilt Copilot as a Progressive Web App users could move, resize, and pin like any other app window. The official line was that a movable window respected workspaces. The user feedback was less generous.

1. September 2023: Fixed taskbar sidebar with deep OS hooks, ships in 23H2.
2. February 2024: Sidebar removed, Copilot rebuilt as a movable Progressive Web App in Moment 5.
3. Late 2024: Native WinUI Copilot app rolls to Insiders, promising tighter Windows integration.
4. May 2025: Copilot hardware key behavior changes; pressing it now opens a lightweight prompt box, not the full app.
5. March to April 2026: Copilot swaps back to a web wrapper, bundled with a private copy of Edge.
6. May 2026: Docking option restores the sidebar layout in a new drop-down menu.

Each step solved one complaint and created another. Power users got a movable window; lighter users lost the always-visible assistant they had only just learned. The shift to a native build promised better Windows integration; the swap back to web rendering undid much of it. We covered the cumulative cost of these resets in how repeated Copilot interface changes wear down user trust.

The May rollout closes the loop. Copilot once again sits flush against a screen edge, reshapes the desktop, and behaves as a permanent piece of furniture instead of an app window. Microsoft has not commented on whether the original case for removing the sidebar still applies, or what changed about it.

The Edge Browser Bundled Inside the Sidebar

The new sidebar is not a native control. Decompilation of the rebuilt Copilot package in April 2026 found that the app ships with a private copy of Microsoft Edge, roughly 850 megabytes of browser binaries tucked inside the assistant’s install folder.

• A complete versioned Edge directory (146.0.3856.97 at the time of inspection)
• msedge.exe and the full Chromium DLL chain (msedge.dll, msedge_elf.dll)
• ffmpeg.dll, Vulkan and SwiftShader graphics layers, WidevineCDM for DRM playback
• A WebView2 container that hosts the Copilot interface as a rebranded web page

In practical terms, hovering over the Copilot title bar to dock the panel invokes a layout layer that has to coordinate with both the Windows shell and a full Chromium engine running inside the app. That coordination is the likely reason Microsoft bundled the full Edge wrapper: a sidebar talking to web-rendered content and to Windows window management at the same time is easier to ship as one package than as two.

It also explains the memory footprint that drew the loudest complaints after the rebuild. Users who tested the new app in April reported it consuming markedly more RAM than the WinUI build it replaced, and a docked panel that stays open all day will amplify that draw. The trade-off mirrors what we wrote about when Microsoft folded Copilot Mode directly into the Edge browser earlier this spring.

Why Copilot Vision Makes Docking Useful Now

Copilot Vision is the feature that makes the docking pitch land. Vision lets the assistant read the active screen and answer questions about what is on it, including extracting text from screenshots, walking users through unfamiliar interfaces, and analyzing content in Word, Excel or PowerPoint files when explicitly shared, according to Microsoft’s Copilot Vision support documentation.

The feature is opt-in. It only sees what users explicitly send through the Share with Copilot button, and it cannot click, type, or scroll on a user’s behalf. Vision graduated from preview to a standard part of Copilot in recent Windows 11 builds, expanding from a small experiment to a full screen-reading capability.

Vision works best when Copilot stays visible alongside the app it is reading. Pulling up a chat in a floating window means the assistant covers the very content it is meant to analyze. Docking solves that. The sidebar holds its column, the rest of the screen stays open to the app, and Vision keeps a view of whatever the user is doing without occlusion.

Microsoft has not confirmed whether enabling Vision will trigger automatic docking. The design points that direction; the formal coupling does not exist yet.

How IT Admins and Consumers Can Block It

For organizations, the controls Microsoft has already published for the consumer Copilot app continue to apply. IT administrators can prevent installation with an AppLocker rule targeting the MICROSOFT.COPILOT package, or remove it from existing devices using a PowerShell call against Get-AppxPackage and Remove-AppxPackage, per the official Windows Copilot management guidance on Microsoft Learn.

The legacy Turn Off Windows Copilot group policy is still available but Microsoft has marked it for near-term deprecation, so the AppLocker route is the supported forward path. For Microsoft Entra accounts on managed devices, the Microsoft 365 Copilot app handles the work scope and the consumer app gets blocked or redirected; the new docking menu only surfaces in the consumer app today.

Consumers without admin policy in play can uninstall the app from Settings, then Apps, then Installed Apps, using the three-dot menu, the same as any other inbox app. Users who want Copilot present but not docked can ignore the new menu entirely. The default standalone window stays the out-of-box behavior, and the dock options are visible but not on. The Copilot hardware key on newer keyboards still opens the lightweight prompt box rather than the docked panel, a separate path Microsoft introduced and we covered when it opened the Copilot key for remapping two years on.

If the docked layout becomes the default once Vision graduates fully across the install base, Microsoft will have completed the round trip without naming it as a reversal. If the rollout stalls at the opt-in stage, the title-bar drop-down will keep sitting one click below where most users ever look.