Build 26300.8758 for Windows 11 26H2 outs with new Taskbar resize option

Windows 11 build 26300.8758 is now available through the Experimental channel for version 26H2.
Microsoft introduces a dedicated Taskbar size setting with Small, Medium, and Large options.
File Explorer gains improved cloud thumbnail previews, a redesigned Details pane, and bug fixes.
The update also improves dark mode system sounds and expands the list of available feature flags.

Microsoft has released the Windows 11 Insider Preview Quality Update (26300.8758) for version 26H2 through the Experimental experience in the Windows Insider Program. This flight introduces improvements for existing features, as well as various fixes, as part of the Windows K2 initiative.

According to the official notes, Windows 11 build 26300.8758 adds a new option to change the Taskbar size independently of the button’s sizing option and rolls out various improvements to File Explorer and Sounds.

What’s new on Windows 11 build 26300.8758 (Experimental)

These are the new features and improvements rolling out in the Experimental channel:

Taskbar sizing option

Taskbar customization is becoming easier with a new dedicated “Taskbar size” setting. Instead of relying on the automatic scaling option, Windows 11 now includes a separate setting that lets you choose between “Small,” “Medium,” and “Large” Taskbar icons.

The change makes the feature easier to find and gives users more direct control over how much space the taskbar occupies on the screen.

One thing to note is that this setting will also affect the “Show smaller app icons” when setting the Taskbar to small.

Finally, the company is also refining the transitions between Taskbar sizes for a smoother experience.

File Explorer improvements

In File Explorer, the company has improved the “Details” pane by making cloud file thumbnail previews more reliable and reorganizing the layout to make file properties easier to find.

This update also fixes an issue that prevented the OneDrive shortcut from working when File Explorer was launched with administrator privileges. In addition, it resolves a bug that caused the permanent delete confirmation dialog to display an internal Recycle Bin filename instead of the original filename.

Sounds changes

According to the company, this update improves system sounds when using the dark mode option.

XBOX mode settings

Although the company isn’t adding new changes to the feature, starting with build 26300.8758, the settings page has been renamed from Xbox mode to XBOX mode.

XBOX mode page name / Image: Mauro Huculak

Feature flags for build 26300.8758

Here’s a complete list of the flags you can use to enable experimental features on Settings > Windows Update > Windows Insider Program > Features flags:

Alternate taskbar positions
Consistent solid (donut) spinners across key Windows scenarios
Fewer update restarts
Fluid Dictation Language Expansion in Voice Access
Fluid Dictation Language Expansion in Voice Typing
Free upgrade path to Windows 11 Pro Education for K-12
Group of win32k changes including touchpad things
Improved Magnifier quick settings access
Magnifier Simplification
Short Query File Search support for 2-character queries in WSB
Show Braille settings by default
Small Taskbar Feature

Download Windows 11 update 26300.8758

To download and install these Windows 11 builds, enroll your Devices in the Experimental channel through the “Windows Insider Program” settings from the “Update & Security” section. Once you enroll the computer in the program, you can download the build from the “Windows Update” settings by turning on the “Get the latest updates as soon as they’re available” option and clicking the “Check for Updates” button.

Alternatively, you can also download the ISO files from the Windows Insider Preview Downloads page. Specific preview builds are available for a limited time only.

Build 26300.8758 for Windows 11 26H2 outs with new Taskbar resize option – Experimental