Microsoft pushed a trio of experimental Windows 11 Insider builds to registered testers on June 26, 2026, delivering a dedicated Taskbar Size setting, a raft of File Explorer reliability improvements, and a more intelligent approach to update coordination. Builds 26300.8758, 28120.2374, and 29617.1000 rolled out across the company’s Experimental tracks, offering early adopters the first taste of several features that had been requested since Windows 11’s launch.
The most prominent addition is the long-anticipated Taskbar Size control, which lets users adjust the height of the taskbar without resorting to registry hacks or third-party tools. In previous releases, Windows 11 offered only a single default taskbar size, frustrating users who preferred the compact layout of older Windows versions or needed larger icons for accessibility. Now, a simple slider under Settings > Personalization > Taskbar allows scaling between three predefined dimensions—small, medium, and large—instantly resizing the bar and its pinned icons. The change brings a visual consistency that had been missing and aligns Windows 11 more closely with the customization depth of Windows 10. The slider is accompanied by a live preview, so changes are visible immediately, though Microsoft warns that some legacy applications may require a restart to fully adapt.
Alongside taskbar tweaks, the builds target long-standing File Explorer pain points. Insiders have reported that File Explorer’s context menu, which was redesigned in the original Windows 11 release, sometimes lags or fails to load custom commands from third-party apps. Build 28120.2374 specifically addresses a race condition that caused explorer.exe to hang when right-clicking on files within OneDrive-synced folders. Another fix eliminates a memory leak that gradually degraded responsiveness during large file copy operations, particularly when using the “extract all” function for ZIP archives. Microsoft’s patch notes also mention improved crash recovery: if File Explorer terminates unexpectedly, it now attempts to restore the previous window state and folder location, reducing workflow disruption. These stability enhancements are critical for power users who rely on Explorer as a hub for file management and who have been vocal in the Feedback Hub about performance regressions.
Update coordination receives a subtle but impactful upgrade in these builds. The “Update and restart” experience has been re-engineered to minimize interruptions by better predicting idle times and coordinating with user-defined active hours. The new system, present in build 29617.1000, uses machine learning to analyze historical usage patterns and schedule restarts during periods of lowest activity, even expanding the restart window when it detects a long idle stretch. Users maintain full control via a revamped Windows Update settings page where they can manually adjust the days and hours for restart scheduling. Additionally, the feature orchestrates updates across multiple restarts if several updates are pending, stacking changes to reduce the total number of reboots. For enterprises, these improvements integrate with existing group policies, allowing IT admins to enforce update coordination without sacrificing the intelligent scheduling.
The builds also include several smaller but noteworthy tweaks. A new network icon in the system tray now indicates when a VPN connection is active, and the Quick Settings panel adds a toggle for night light intensity. The Settings app sees a UI refresh for Bluetooth devices, listing battery levels of connected peripherals more prominently. Under the hood, Microsoft has updated the kernel with mitigations for the Spectre v2 variant of side-channel attacks, though this change was previously delivered via security patches. Graphics drivers benefit from improved WDDM 3.1 support, reducing stutter in games that use DirectStorage when an NVMe SSD is present.
Getting these builds requires enrolling a device in the Windows Insider Program and selecting an Experimental track—typically the Canary, Dev, or a newly introduced builds track that Microsoft has been using to test radical features. Users must ensure their PC meets the minimum hardware requirements, including TPM 2.0 and Secure Boot, and they should back up critical data, as these preview builds may contain instabilities. Microsoft emphasizes that features in experimental tracks are not guaranteed to ship in the next general release but often indicate the direction of the OS.
Community reception, mirrored across forums and social media, has been largely positive, particularly regarding the taskbar size option. Many long-time Windows users have expressed relief that Microsoft is finally addressing this request, with some noting that the feature should have been present at launch. The File Explorer fixes are also seen as a step toward restoring the performance that Windows 10 users enjoyed before the overhaul. However, some testers have reported that the new update coordination can be too aggressive, restarting systems during short away-from-keyboard moments if not carefully configured. Microsoft has acknowledged this feedback and may refine the detection algorithm in subsequent flights.
The June 26 builds represent a convergence of stability and customization efforts that will likely shape the upcoming Windows 11 feature update expected later in the year. By tackling both functional gaps and under-the-hood reliability, Microsoft is signaling a more user-driven approach to Insider development. For now, Insiders can enjoy a more personalized taskbar, a more resilient File Explorer, and smarter updates—all while providing feedback that will influence the final public rollout.