Windows 11 25H2 Preview: Step-by-Step Guide to Enable the New Image Background Features and Dark Mode Improvements

Windows 11 25H2 preview builds are gradually modernizing legacy UI, tightening dark mode consistency, and introducing new experiences that show up first in Insider channels. The challenge is that many of these changes roll out using Controlled Feature Rollout (CFR), which means two people on the same build can see different features.

This guide walks you through a reliable, repeatable process to:

• Get onto a 25H2-era Beta build
• Turn on and validate dark mode improvements
• Locate and use the new image background experiences (often surfaced through File Explorer “AI actions”)
• Force-enable missing features (advanced) using ViVeTool
• Roll back safely if needed

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What You Need Before You Start

1) Use a non-production device if possible

Insider builds can introduce regressions. If you rely on this PC for work, strongly consider testing in a VM or on spare hardware.

2) Confirm your Windows 11 version

Go to:

• Settings > System > About
• Check Windows specifications

If you are not on Windows 11 already, stop here and upgrade first.

3) Back up important data

At minimum:

• Confirm OneDrive sync is healthy (if used)
• Copy critical folders to an external drive or a cloud backup

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Step 1: Join the Windows Insider Program (Beta Channel)

To get the 25H2 preview build stream, the Beta Channel is the typical path for features that are closer to release than Dev experiments.

1. Open Settings
2. Go to Windows Update
3. Select Windows Insider Program
4. Click Get started
5. Link your Microsoft account (if prompted)
6. Choose Beta Channel
7. Confirm and restart if required

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Step 2: Install the Latest Beta Build Update

Once you are enrolled, pull down the build through Windows Update:

1. Go to Settings > Windows Update
2. Click Check for updates
3. Install the available Insider update (for example, a 26220.x build)
4. Restart when prompted

Verify the build installed successfully

After reboot:

1. Go to Settings > System > About
2. Confirm the OS build reflects the Insider update you installed

If the build number did not change, check the troubleshooting section at the end of this post.

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Step 3: Enable Dark Mode and Validate the Improvements

Even if you already use dark mode, flip the setting once to ensure the system applies it across updated components.

1. Open Settings
2. Go to Personalization > Colors
3. Set Choose your mode to Dark
4. Optional, but helpful for testing:
   • Toggle Transparency effects
   • Set Accent color to something obvious

What “dark mode improvements” typically look like

Depending on rollout status, you may notice improvements such as:

• Better consistency across dialogs and legacy screens
• Fewer bright “flashbang” windows during transitions
• More uniform theming across File Explorer surfaces

Because these changes can be CFR-controlled, you might not see them immediately on first reboot.

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Step 4: Find the “New Image Background” Feature (Often via File Explorer AI Actions)

In recent Windows 11 preview experiences, “image background” enhancements often show up as image-specific actions inside File Explorer.

To check:

1. Open File Explorer
2. Navigate to a folder with JPG or PNG images
3. Right-click an image
4. Look for a menu entry such as:
   • AI actions
   • Image actions related to background changes (wording can vary by build)

If you see AI actions, try one and confirm the result applies to the image as expected.

If you do not see it

That usually means one of the following:

• The feature is in CFR and not enabled for your device yet
• The feature requires specific device capabilities
• The feature needs an additional reboot after the update

Before doing anything advanced, reboot once more and test again.

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Step 5: Force-Enable Missing Features (Advanced: ViVeTool)

If you updated successfully but key UI changes are missing, you can try enabling the underlying feature flags manually.

Important notes before you do this

• Feature IDs can change between builds
• Some flags will not work if the feature is server-controlled or gated by device requirements
• Always know how to roll back before you begin

A) Download and extract ViVeTool

1. Download ViVeTool from its GitHub releases page
2. Extract it to a simple path, for example:
   • C:\ViVeTool

B) Run Command Prompt as Administrator

1. Click Start
2. Type cmd
3. Right-click Command Prompt and select Run as administrator

C) Navigate to the folder

cd /d C:\ViVeTool

D) Enable feature IDs (example set commonly used for dark-mode dialog improvements)

vivetool /enable /id:57857165,57994323,48433719,49453572,58383338,59270880,59203365

Then restart your PC.

E) Check what is enabled

vivetool /query

Rollback options

If anything breaks or behaves oddly:

• Disable a specific feature ID:

vivetool /disable /id:XXXXX

• Reset everything ViVeTool changed:

vivetool /fullreset

Then restart.

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Step 6: Quick Troubleshooting Checklist

If you are stuck, use this sequence in order:

1) Windows Update is not offering the build

• Confirm you selected Beta Channel
• Check Settings > Windows Update for pause settings
• Reboot and check again

2) You installed the build but features are missing

• Reboot once more (CFR can be delayed)
• Test on a second account profile (rare, but can matter)
• Only then consider ViVeTool

3) Things got worse after enabling flags

• Run:
  • vivetool /fullreset
• Reboot
• Confirm stability before re-testing individual flags

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Enterprise Note for Intune-Managed Devices

If this is a corporate device, Insider enrollment can be blocked by policy. If the Insider Program page is missing, greyed out, or errors, check:

• Windows Update for Business configuration
• Update ring policies that restrict preview builds
• Any tenant-wide settings that block Insider enrollment

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Final Takeaway

Windows 11 25H2 preview builds can deliver meaningful UI improvements, but CFR makes testing inconsistent across devices. The most reliable workflow is:

1. Join Beta
2. Update and verify the build
3. Validate dark mode and File Explorer image actions
4. Reboot once more if features are missing
5. Use ViVeTool only if you are comfortable with feature flags and rollback