Look for this Windows Spotlight wallpaper

Find Spotlight wallpapers manually
1. Open File Explorer and navigate to the following path:
C:\Users\<username>\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets
You will see some files with no extension, these are the Spotlight wallpapers.
Copy these files to another folder and add the .jpg extension to view them.
2. Use the third party tool SpotBright: Automatically save Spotlight wallpapers and set them as your desktop background.
Dynamic Theme: Downloaded from Microsoft Store, it supports automatically applying Spotlight wallpapers.
3. Using PowerShell Scripts: Open PowerShell (with administrator privileges).
Run the following script:
powershell
$spotlightPath = “$env:LocalAppData\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets”
$destinationPath = “$env:UserProfile\Pictures\Spotlight”
if (-not (Test-Path $destinationPath)) { New-Item -ItemType Directory -Path $destinationPath }
Get-ChildItem -Path $spotlightPath | ForEach-Object {
    if ($_.Length -gt 100KB) {
        Copy-Item -Path $_.FullName -Destination “$destinationPath\$($_.Name).jpg”
    }
}
The script saves the Spotlight wallpaper to the Pictures\Spotlight folder.