Microsoftは6月9日(現地時間)、Windows 11のWindows Insider ProgramのDevチャンネル向けの最新ビルド「Windows 11 Insider Preview Build 26200.5641(KB5060824)」をリリースしました(Windows Blog)。Devチャンネルで公開されるビルドは、将来の機能アップデートで追加される可能性のある、さまざまな新機能が先行して実装されています。特定のリリースとは直接結びつけられておらず、ビルドに含まれる新機能や改善点は、準備が整い次第、将来のWindowsリリースに反映される可能性があります。Windows Insider Programの更新オプションでDevチャンネルを選択し、Windows 11のプレビュー版を使用しているユーザーは、Windows Updateを利用して最新版に更新することができます。Build 26200.5641の新機能Build 26200.5641では、新しいスタートメニューが導入されています。ピン留めされたアプリ、推奨アプリ/ファイル、インストール済みアプリをカテゴリー別に表示し、「すべて」のセクションでは、カテゴリー表示とグリッド表示を選択することができます。ロック画面ウィジェットのカスタマイズ機能の追加や、Windows検索設定の改良なども行われています。リリースノートは以下の通りです。New features gradually being rolled out to the Dev Channel with toggle on*Introducing the new Start menu for Windows 11Easily launch all your apps with scrollable Start menuWe’re making it easier for you to launch your apps with our updated, scrollable Start menu. With “All” now on the top-level, apps are easily accessible without having to navigate to a secondary page. In addition, we’re introducing two new views to browse and launch your installed apps in the “All” section: category and grid view.The new default Category view automatically groups your apps by category for quick access to your most used categories and apps. So, if your most used apps are Outlook and Solitaire, you can expect those apps to bubble up to the top in their respective categories. Categories are formed when there are at least 3 apps in each respective category. Otherwise, they will remain in the “Other” category.Grid view is ordered alphabetically like List view but allows for better scanning of all your installed apps with more horizontal real estate. With new view options to choose from in the “All” section, we’ll remember your last used view so you can reliably launch your apps with the view you prefer most.Experience a larger Start menu with responsive sectionsWe’re making better use of your screen real estate by adapting the size of the Start menu based on your screen size. Have a larger-screen device? You can expect to see a larger Start menu, by default, so you can see more of your apps and files. On larger devices, users can expect to see 8 columns of pinned apps, 6 recommendations, and 4 columns of categories in the Start menu. On smaller devices, you’ll see 6 columns of pinned apps, 4 recommendations, and 3 columns of categories.Sections within Start are also responsive so you can see more or less of your Pinned and Recommended sections. Have only a few pins? The Pinned section will shrink down to a single row and other sections will slide up. If you prefer to always have your pins expanded by default, you can do so via Settings.If you’d prefer to not see recommendations, then turn off the following toggles in Settings > Personalization > Start: “Show recently added apps,” “Show recommended files in Start…,” “Show websites from your browsing history,” and “Show recommendations for tips…” If there aren’t any recommendations available, the section will collapse so you can see more of your installed apps.Seamless cross-device integration with Phone LinkLastly, we’ve updated Start to continue allowing you to take advantage of powerful cross-device features. Now, you can easily expand and collapse mobile device content using the new mobile device button next to the Search box.This cross-device integration is generally available for connected Android and iOS devices in most markets and will be coming later in 2025 to the European Economic Area.FEEDBACK: Please file feedback in Feedback Hub (WIN + F) under Desktop Environment > Start menu.Choose what Lock screen widgets appearAfter rolling this experience out to Windows Insiders in the EEA, we are now beginning to roll out more widget options on the lock screen as well as support for lock screen widget personalization (previously referred to as “Weather and more”) with Insiders in all regions. You can add, remove, and rearrange lock screen widgets such as Weather, Watchlist, Sports, Traffic, and more. Any widget that supports the small sizing option can be added here. To customize your lock screen widgets, navigate to Settings > Personalization > Lock screen.FEEDBACK: Please file feedback in Feedback Hub (WIN + F) under Desktop Environment > Lock screen.Screen Curtain in NarratorThe Screen Curtain feature in Narrator is designed to enhance privacy and focus for users who rely on screen reading. When activated, Screen Curtain completely blacks out the display, ensuring that only the user hears what’s on the screen through Narrator, while the visual content remains hidden from view. This is especially useful in public spaces or shared environments, allowing users to read and work with sensitive information without revealing it to others nearby.How to enable/disable Screen Curtain:Turn On Narrator using Ctrl + Win + Enter.Press Caps + Ctrl + C to enable Screen Curtain.Try using Narrator, while your Screen Curtain is turned on.Press Caps + Ctrl + C to disable Screen Curtain.FEEDBACK: Please file feedback in Feedback Hub (WIN + F) under Accessibility > Narrator.Changes and Improvements gradually being rolled out to the Dev Channel with toggle on*[Windows Search]Today, we rationalize and organize Windows Search settings under Settings > Privacy & security under a “Search permissions” settings page and a “Searching Windows” settings page. We are beginning to roll out a change that brings those two settings pages together so you can easily access to all the Windows Search settings under a single settings page via Settings > Privacy & security > Search. The page is refreshed with a new modern visual for you to clearly browse the settings and control your experiences inside Windows Search, with the items listed in a better order.[Narrator]We’re introducing a smoother way to discover and learn about Narrator capabilities right from experience. Whether you’re a new user or exploring deeper functionality, Narrator will now guide you through its new features by launching a series of modal windows which contain the details of all the new features and changes in Narrator.[Input]The Gamepad layout of the Windows touch keyboard has been updated with enhanced controller navigation and improved focus handling for child keys, flyout menus, word suggestions, language switching, settings, and more.We have designed a new Gamepad keyboard, optimized for gaming, to support PIN sign-in on the Windows lock screen. It features controller shortcuts for quick PIN entry, along with full controller navigation for users who prefer not to use shortcuts.Fixes gradually being rolled out to the Dev Channel with toggle on*[General]This build should fix an underlying issue in the previous flight which was causing input to not work for some Insiders, including when typing into Search, and with the Chinese pinyin IME candidate window, clipboard history, and the emoji panel.[Recall (Preview)]The following fixes are rolling out for Recall on Copilot+ PCs:Fixed an issue causing Recall to crash for some Insiders in the last couple flights.[Taskbar]Fixed an issue where in some cases taskbar icons might appear small even though the setting to show smaller taskbar buttons was configured as “never”.[File Explorer]Fixed an issue where restoring a File Explorer search result from Recall would open File Explorer but not show your search string.[Windowing]Fixed an issue where ALT + Tabbing out of a full screen game could lead to other windows freezing (like Windows Terminal).[Login and lock]Fixed an issue causing the lock screen to crash for some Insiders in the previous flight.[Graphics]Fixed an issue causing some displays to be unexpectedly green after the latest flights.[Settings]Fixed an underlying issue which could lead to the Settings window hanging and no longer responding to input or resizing unless you closed and reopened it.Fixed an issue in System > Display, where if UAC was set to Always Notify and you tried to click the button to do color calibration for your display and cancelled, it would crash Settings.Fixed an issue in System > Display, where a chevron might display for Brightness even if there were no additional settings to display.Fixed an issue where if you changed to a custom mouse cursor in Accessibility > Mouse pointer and touch, it could make Settings crash.Fixes for everyone in the Dev Channel[General]We fixed the issue where you might see severe discoloration when connecting your PC to some older Dolby Vision displays.Known issues[General]After you do a PC reset under Settings > System > Recovery, your build version may incorrectly show as Build 26100 instead of Build 26200. This will not prevent you from getting future Dev Channel updates, which will resolve this issue.The option to reset your PC under Settings > System > Recovery will not work on this build.We’re investigating an issue causing a small number of Insiders to experience repeated bugchecks with KERNEL_SECURITY_CHECK_FAILURE after upgrading to most current Dev Channel builds.[NEW] Some Windows Insiders may experience a rollback trying to install this update with a 0x80070005 in Windows Update. We’re working on a fix for the next flight.[Start menu]The following are known issues for Windows Insiders with the new Start menu:[NEW] Using touch to navigate the new Start menu may not work reliably. For example, it currently does not support the swipe-up gesture.[NEW] Drag and drop capabilities are limited from “All” to “Pinned.”[NEW] In some cases, duplicate entries may appear in folders on the Start menu.[Xbox Controllers]Some Insiders are experiencing an issue where using their Xbox Controller via Bluetooth is causing their PC to bugcheck. Here is how to resolve the issue. Open Device Manager by searching for it via the search box on your taskbar. Once Device Manager is open, click on “View” and then “Devices by Driver”. Find the driver named “oemXXX.inf (XboxGameControllerDriver.inf)” where the “XXX” will be a specific number on your PC. Right-click on that driver and click “Uninstall”.[Click to Do (Preview)]The following known issues will be fixed in future updates to Windows Insiders:Windows Insiders on AMD or Intel-powered Copilot+ PCs may experience long wait times on the first attempt to perform intelligent text actions in Click to Do after a new build or model update.[Improved Windows Search][REMINDER] For improved Windows Search on Copilot+ PCs, it is recommended that you plug in your Copilot+ PC for the initial search indexing to get completed. You can check your search indexing status under Settings > Privacy & security > Searching Windows.[File Explorer]The following are known issues for AI actions in File Explorer:Narrator scan mode may not work properly in the action result canvas window for the Summarize AI action for Microsoft 365 files when reading bulleted lists. As a workaround, you can use Caps + Right key to navigate.[Widgets]Until we complete support for pinning in the new widgets board experience, pinning reverts you back to the previous experience.公式ブログには細かな変更内容がリストアップされていますので、インストールする前に確認することをおすすめします。