SharePoint Online: How to Disable Sharing for Non-Owners using PowerShell?

Requirement: Disable Sharing for Non-Owners in SharePoint Online.

How to Disable Sharing for Members in SharePoint?

To disable sharing for members in SharePoint Online, follow these steps:

• Settings >> Site Settings >> Site Permissions
• Click on “Access Request Settings” button in the ribbon. 
• Uncheck “Allow members to share the site and individual files and folders.”. You can also uncheck  “Allow members to invite others to the site members group, <Group Name>. This setting must be enabled to let members share the site. “

This disables share button for non-owners (members) for a given site.

PowerShell to Disable Sharing for Non-Owners:

Here is the PowerShell to disable sharing for non-owners in SharePoint Online.

#Config Variables
$AdminSiteURL= "https://crescent-admin.sharepoint.com"
$SiteURL= "https://crescent.sharepoint.com/sites/marketing"
 
#Connect to SharePoint Online services
Connect-SPOService -url $AdminSiteURL -Credential (Get-Credential)

#Disable Sharing for Non-Owners
Set-SPOSite -Identity $SiteURL -DisableSharingForNonOwners

Found a problem though! when you run this script for the first time, it disables access request! To disable share button in SharePoint Online, use: How to Disable Share Feature in SharePoint Online?