Microsoft releases Windows 10 Insider Preview Build 21337

Microsoft releases Windows 10 Insider Preview Build 21337

Windows Insiders on the dev channel have new build of Windows 10 available for Windows Insiders. Build 21337 has new virtual desktop features, Auto HDR, and changes to file explorer.

For Windows Insiders that use Virtual Desktop there is ability to reorder and customise your desktops.

UPDATE: Here is my hands on video

Change Virtual Desktop background:

Under Settings > Personalization > Background, left click a background to change the background for the active Virtual Desktop.

Right clicking a background on this Settings page has a new option to change the background for a specific Virtual Desktop.

Once you’ve made the change, you’ll see your new background when you switch to that Virtual Desktop, and in the preview thumbnail in Task View.

Reorder Virtual Desktops:

Enter Task View (via Win + Tab), create multiple new Virtual Desktops.

Drag and drop a Virtual Desktop to another position in the list in Task View.

Right click a Virtual Desktop thumbnail in task view and select “Move left” or “Move right” in the context menu to move the desktop to another position.

Use keyboard navigation to set focus to the desired Virtual Desktop in Task View, and then press ALT + Shift + Left / Right Arrow to move it in either direction in the list.

For games there is a preview of Auto HDR for PC gaming. With it enabled you get HDR gaming on Windows 10 PC games, there are more details on the DirectX blog post.

This build updates File Explorer with extra padding and so there is now a new compact mode that restores the original layout. The extra padding should be good for touch screen devices but if you don’t like it you can go back to the classic view.

The Inbox apps like Notepad are now updates via the Microsoft Store (along with a new icon) and Windows Terminal and Power Automate are now includes as an inbox app. Lookout for my Windows Insider video coming soon.

Here are the other changes, fixes and known issues with build 21337:

Changes and Improvements

We are now rolling out the new IME candidate window design to all Windows Insiders I the Dev Channel using Japanese, Chinese Traditional, and Indic IMEs. We’ll let you know once the rollout for the remaining IMEs increases.

We’re updating the emoji panel (WIN + Period) to support searching in more languages, including Amharic, Belarus, Cherokee, Filipino, Faroese, Icelandic, Khmer, Mongolian (Cyrillic script), Burmese, Sindhi, Serbian (Cyrillic script), Serbian (Latin script), Swahili, Thai, Turkmen, Tonga, Uzbek (Latin script), and Cantonese (Traditional). Please continue sharing feedback about the emoji search results in the Feedback Hub under Input and Language > Emoji Panel.

Live previews for websites pinned to the taskbar from Microsoft Edge are now rolling out for all Insiders.


We fixed a DWM memory leak impacting Insiders in recent flights.

We fixed an issue resulting in errors for some Insiders when trying to launch Settings via URI, including when using the Display Settings and Personalization options when right clicking the desktop.

We fixed an issue where if you click on the Advanced Options page under Settings > Update & Security > Windows Update would crash Settings in the previous flight.

We fixed a set of issues causing crashes in many x64 apps on ARM64, particularly in scenarios involving video or DRM content. Examples of x64 apps no longer crashing include Microsoft Translator, BlueJeans, The CW, Alexa, Astroneer, and Epic Games Launcher.

We fixed an issue that could result in the Windows Security icon in the taskbar saying an action was needed, but the app had no actions to take.

We fixed an issue that could result in the Windows Security icon in the taskbar being unresponsive.

We fixed an issue in recent flights that could result in some games freezing after locking and unlocking your PC while the game was in full screen mode. This issue may also have resulted in freezes after ALT + Tab.

We fixed an issue in recent flights resulting in flickering when hovering over icons and buttons in certain apps.

We fixed an issue in recent flights for some Insiders with domain joined devices where their credentials for apps and websites would unexpectedly be lost on upgrade.

We fixed an issue resulting in some Insiders noticing that System File Checker (SFC) tool would erroneously saying it found corrupt files the first time it was run after each upgrade.

We fixed an issue causing certain UPS to show up in Device Manager with error code 43.

We fixed an issue that could result in werfault.exe crashes.

We fixed an issue in recent builds resulting in some insiders not being able to resume their devices from sleep or experiencing a bug check with the error IRQL_NOT_LESS_OR_EQUAL.

We fixed an issue resulting in some Insiders unexpectedly seeing a Bitlocker recovery screen after upgrading to recent Dev Channel builds.

We fixed a ctfmon.exe crash impacting the reliability of voice typing (WIN + H).

We fixed a ctfmon.exe crash that could occur if you switched to a Microsoft IME while in a 3rd party IME reconversion session.

We fixed an issue in recent builds that could result in Search not opening after clicking the search box in the taskbar.

Known issues

We’re looking into reports of the update process hanging for extended periods of time when attempting to install a new build.

We’re working on enabling the new taskbar experience for existing pinned sites. In the meantime, you can unpin the site from the taskbar, remove it from the edge://apps page, and then re-pin the site.

[News and interests] We’re addressing an issue where news and interests may not be available when signing into Windows without internet access but returns when online.

[News and interests] Sometimes the news and interests flyout cannot be dismissed with pen.

[ARM64] Insiders who installed the preview version of the Qualcomm Adreno graphics driver on the Surface Pro X may experience reduced brightness of the display. This issue is fixed with an updated version of the preview graphics driver at If you are experiencing this issue, please see the feedback collection for more information.

We’re working on a fix for an issue where some devices with Realtek network adapters running driver version may experience intermittent loss of network connectivity.

We are working on the fix for an issue where on some high-refresh-rate monitors, games will only run at 60Hz. Variable-refresh-rate monitor scenarios may also result in tearing.

The network flyout on the login screen doesn’t open on this build, which will prevent you from connecting to a new network before logging in. If your account is in a state that requires internet to log in, you can work around the issue by plugging in Ethernet, getting the device in range of a previously configured Wi-Fi network, or logging in with any other available account first.

We are working on the fix for an issue Insiders reported in the previous flight where devices with certain NVMe drives may experience disk resets or WHEA_UNCORRECTABLE_ERROR bugchecks. If you were impacted by this on Build 21332, you may want to pause updates.

We’re investigating reports of an issue with some devices receiving DPC_WATCHDOG_ERROR bugchecks. If you were impacted by this on Build 21332, you may want to pause updates.



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