Change how members can share files, folders, and the site using PowerShell

Question

Is it possible to change the Site sharing settings using PnP PowerShell or SPO PowerShell? This includes 'Sharing permissions' as well as 'Access Requests'. These settings for any site can be found under:

Settings > Site permissions > Change how members can share

Answer 1

According to my research, there is currently no complete PowerShell command that can support to change the Site sharing settings. However, you can use the following workaround.

You can use the below PowerShell command to prevents non-owners of a site from inviting new users to the site.

Set-SPOSite -Identity https://contoso.sharepoint.com -DisableSharingForNonOwners

For more information, please refer to "Set-SPOSite".

Answer 2

The settings you are looking for can be also found in Site Settings > Site Permission > Access Request Settings (/_layouts/15/user.aspx) where by the wording you can find better search results on web, anyway you can use this piece of powershell to configure it.

PNP Powershell:

Connect-PnPOnline -url "YOUR-SITE-URL-HERE" -Interactive

$web = Get-PnPWeb -Includes MembersCanShare, AssociatedMemberGroup.AllowMembersEditMembership
$web.MembersCanShare=$false
$web.AssociatedMemberGroup.AllowMembersEditMembership=$false
$web.AssociatedMemberGroup.Update()
$web.RequestAccessEmail = $null
$web.Update()
$web.Context.ExecuteQuery()