SharePoint Online: Disable Page Comments in Modern Sites using PowerShell

Requirement: Disable page comments in SharePoint Online Modern Sites and Communication sites.

How to Disable Page Comments in SharePoint Online?
Modern pages in SharePoint Online have a comments section at the bottom of each page for better collaboration.

Option 1: Disable Comments at the tenant level
Page comments can be turned-off at tenant level by the below settings:

• Navigate to SharePoint Online Admin Center: https://yourdomain-admin.sharepoint.com 
• Click on Settings from left navigation
• On the Settings page, Select "Disable Comments on Site Pages."
  
• Click OK to save your changes.

In modern admin center, This is moved under:

• Settings >> Pages >> "Allow commenting on modern pages"
  

Wait for a while, the comments section disabled from all pages in the tenant. You can disable comments on modern pages at tenant level using PowerShell as well.

SharePoint Online: Turn off comments by default
Use this PowerShell to disable page comments in SharePoint Online, Tenant-wide:

$AdminCenterURL="https://crescent-admin.sharepoint.com"

#Connect to SharePoint Online
Connect-SPOService -Url $AdminCenterURL -Credential (Get-Credential)

#Disable Comments on Site Pages at Tenant Level
Set-SPOTenant -CommentsOnSitePagesDisabled $True

Option 2: Disable Comments at the Page Level 
Comments can be disabled at page level. Here is how:

• Navigate to the SharePoint Online Site page >>  Edit the page.
• Turn off the comments by toggle the switch from ON to OFF position and Publish the page.
  

This disables comments section in the particular page.

Option 3: Disable Comments in SharePoint Online Pages using PowerShell
This PowerShell script disables the page comments for given site.

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
 
#Config Parameters
$SiteURL="https://crescent.sharepoint.com/sites/GroupIT"
 
Try {
    #Get Credentials to connect
    $Cred= Get-Credential
 
    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
    $Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
  
    #Get the Web
    $Web = $ctx.Web
    $Ctx.Load($Web)
    $Ctx.ExecuteQuery()

    #Disable Comments in Site Pages
    $Web.CommentsOnSitePagesDisabled = $True
    $Web.Update()
    $Ctx.ExecuteQuery()
    Write-host -f Green "Page Comments has been disabled Successfully!"
}
Catch {
    write-host -f Red "Error:" $_.Exception.Message
}

Please note, disabling comments doesn't delete existing comments on pages. It just hides them. Turning ON comments brings the comments back!

PnP PowerShell to Disable Comments on All Pages in a Library

#Parameter
$SiteURL= "https://crescent.sharepoint.com/sites/marketing/2018"
$LibraryName = "SitePages"

#Connect to PnP Online
Connect-PnPOnline -Url $SiteURL -Credentials (Get-Credential)

#Get all Pages from the Library
$Pages = Get-PnPListItem -List $LibraryName

#Loop through each Page 
ForEach($Page in $Pages)
{
    #Disable Comments
    Write-host "Disabling Commnets on page:"$Page["FileLeafRef"]
    Set-PnPClientSidePage -Identity $Page["FileLeafRef"] -CommentsEnabled:$False
}