I am aware of the scripts Microsoft and others have provided to enable the new 'modern' experience/UI in SharePoint Online. When I run the below code, however, the experience does not change. I am testing by visiting the site contents page of the root web.

public static void EnableNewExperience(Web web, bool enableRootCollectionFeature)
    ClientContext ctx = (ClientContext)web.Context;
    Guid siteFeatureId = new Guid("E3540C7D-6BEA-403C-A224-1A12EAFEE4C4");
    ctx.Site.Features.Remove(siteFeatureId, true);

I am using the following PowerShell to change between modern and classic experience. This is working as expected and tested site contents and libraries.

#Script to enable / disable modern experience to site collection

$host.Runspace.ThreadOptions = "ReuseThread"  

#Required Parameters 

$sSiteColUrl = "<<site collection url>>"  
$sUserName = "<<user name>>"  
$sPassword = Read-Host -Prompt "Enter your password: " -AsSecureString 
$featureId = "E3540C7D-6BEA-403C-A224-1A12EAFEE4C4"

    #Adding the Client OM Assemblies         
    Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.dll" 
    Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Runtime.dll" 

    #SPO Client Object Model Context 
    $spoCtx = New-Object Microsoft.SharePoint.Client.ClientContext($sSiteColUrl)  
    $spoCredentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($sUsername, $sPassword)   
    $spoCtx.Credentials = $spoCredentials       

    ##Change to modern experience
    $featureguidSite = [Guid]"E3540C7D-6BEA-403C-A224-1A12EAFEE4C4"
    $spoCtx.Site.Features.Remove($featureguidSite, $true);

    ##revert to classic experience
    $spoCtx.Site.Features.Add($featureId, $true, [Microsoft.SharePoint.Client.FeatureDefinitionScope]::None);

catch [System.Exception] 
    write-host -f red $_.Exception.ToString()    
  • Thanks for the help. The ##Change to modern experience section in the code is exactly what I am doing in C# to no avail. Any idea why it wouldn't work? maybe some setting somewhere? – Kevin Stone Jul 18 '17 at 13:08
  • I have tested and worked without additional steps. Can you try from a different browser or clear cache? – Venkat Konjeti Jul 18 '17 at 13:33
  • I tried IE, Chrome, Firefox, and Edge and cleared cache, but this did not seem to affect it. Interesting thing is I am able to create a new page with the modern UI, but the site contents and each library continues to show the classic UI. I can get the libraries to work if I enable them in the advanced settings, but I'd rather not go library by library programmatically or manually, shouldn't it inherit from the site collection? – Kevin Stone Jul 18 '17 at 17:37
  • @KevinStone - Depending on the features that you have enabled on a doclib / list, you might default to the classic experience because you are using functionality that doesn't exist in the modern experience. If you create a plain doclib / list, do you still see a classic experience? – PatMill_MSFT Jul 18 '17 at 18:10
  • @PatMill_MSFT - Very good point, I had forgotten about that, but this is a brand-new site collection with no customization of any kind. For kicks, I created another site collection, and tried removing the feature. I got an error that the feature was not activated at that scope. I feel like I'm missing something obvious – Kevin Stone Jul 20 '17 at 17:45

The problem was that we needed to enable the modern UI globally via the SharePoint admin center first. Then we had to opt-out of the new experience using code on our site collections where we did not want it enabled by ADDING the feature with the GUID "E3540C7D-6BEA-403C-A224-1A12EAFEE4C4".

  1. We enabled the new experience globally in the SharePoint Admin center
  2. We then ENABLED the feature E3540C7D-6BEA-403C-A224-1A12EAFEE4C4 at the site collection level for site collections where we wanted to DISABLE the new, modern UI. This allowed us to opt-out of the new experience.

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