O365 Sharepoint - Set Default Behaviour Open with Client Apps

Question

I know on a per-site basis we can do the following:
At the document library level, we could go to Library settings>Advanced settings>Open in the client application:

Then go to Site information>View all site settings>Site Collection features> activate the feature as shown below:

But how can I do this:
A) Globally to all existing sites/libraries
B) As the default for newly created sites/libraries

I tried with

Connect-PnPOnline $SiteURL  
$FeatureID = "8a4b8de2-6fd8-41e9-923c-c7c3c00f8295"  
Enable-PnPFeature -Identity $FeatureID -Scope Site  

Although this completes without error the it only updates the later section for the collection and also it doesn't help me default this decision for new objects.

Answer 1

Hi @Andy Kilgore
To globally activate “Open Documents in Client Applications by Default” feature on all existing sites of the tenant, you could can use the following code.

#Parameters  
$TenantAdminURL = "https://Crescent-Admin.SharePoint.com"  
$FeatureId = "8a4b8de2-6fd8-41e9-923c-c7c3c00f8295" #"Following Content" Web Scoped Feature  
    
#Function to Activate a Web Feature in SharePoint Online  
Function Activate-PnPWebFeature  
{  
    [cmdletbinding()]  
    Param(  
        [parameter(Mandatory = $true, ValueFromPipeline = $True)] $Web,  
        [parameter(Mandatory = $true, ValueFromPipeline = $False)] $FeatureId  
    )  
    
    Try {  
        Write-host -f Yellow "Trying to Activate Feature on:"$web.Url  
        #Get the Feature to activate  
        $Feature = Get-PnPFeature -Scope Web -Identity $FeatureId -Web $Web -Connection $SiteConn -ErrorAction Stop  
    
        #Check if the Feature is Activate  
        If($Feature.DefinitionId -eq $null)  
        {  
            #Activate the feature  
            Enable-PnPFeature -Scope Web -Identity $FeatureId -Force -Web $Web -Connection $SiteConn -ErrorAction Stop  
            Write-host -f Green "`tFeature Activated Successfully!"  
        }  
        Else  
        {  
            Write-host -f Cyan "`tFeature is already active!"  
        }  
    }  
    Catch {  
        write-host "`tError Activating Feature: $($_.Exception.Message)" -foregroundcolor Red  
    }  
}  
    
#Connect to Admin Center  
$Cred = Get-Credential  
Connect-PnPOnline -Url $TenantAdminURL -Credentials $Cred  
    
#Get All Site collections - Exclude: Seach Center, Mysite Host, App Catalog, Content Type Hub, eDiscovery and Bot Sites  
$SitesCollections = Get-PnPTenantSite | Where -Property Template -NotIn ("SRCHCEN#0", "SPSMSITEHOST#0", "APPCATALOG#0", "POINTPUBLISHINGHUB#0", "EDISC#0", "STS#-1")  
    
#Loop through each site collection  
ForEach($Site in $SitesCollections)  
{  
    #Connect to site collection  
    $SiteConn = Connect-PnPOnline -Url $Site.Url -Credentials $Cred  
    
    #Call the Function for Web & all Subwebs  
    Get-PnPWeb -Connection $SiteConn | Activate-PnPWebFeature -FeatureId $FeatureId  
    Get-PnPSubWebs -Connection $SiteConn -Recurse | ForEach-Object { Activate-PnPWebFeature $_ -FeatureId $FeatureId}  
    
    Disconnect-PnPOnline -Connection $SiteConn   
}  

As to the second requirement, currently we could not activate the feature as the default for newly created sites/libraries.

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