SharePoint Online: Hide content type on list

Task

Hide Content type on SharePoint Online document library.

Solution

Requires PnP-Powershell, installation instructions here.

Connect-PnPOnline –Url “https://tenant.sharepoint.com”
$ctx = Get-PnPContext

$web = Get-PnPWeb

$doclib = Get-PnPList -Identity "<DOCLIBNAME>" -Includes ContentTypes,RootFolder.UniqueContentTypeOrder

$rootFolder = $doclib.RootFolder

$ct = $doclib.ContentTypes | where {$_.Name -eq "<CT TO BE HIDDEN>"}
$ct2 = $doclib.ContentTypes | where {$_.Name -eq "<CT TO BE HIDDEN, USUALLY FOLDER>"}

if($rootFolder.UniqueContentTypeOrder -eq $null)
{
     $contentTypesInPlace = New-Object -TypeName 'System.Collections.Generic.List[Microsoft.SharePoint.Client.ContentTypeId]'

    #$contentTypesInPlace = $doclib.ContentTypes | where {$_.Id -ne $ct.Id}
     foreach($ct in $doclib.ContentTypes | where {$_.Id -ne $ct.Id -and $_.Id -ne $ct2.Id})
     {
         $contentTypesInPlace.Add($ct.Id)
     }
}
else
{           
     $contentTypesInPlace = [System.Collections.ArrayList] $rootFolder.UniqueContentTypeOrder
     $contentTypesInPlace = $contentTypesInPlace | where {$_.StringValue -ne $ct.Id}
}
         
#Set the UniqueContentTypeOrder to the collection we made above
$rootFolder.UniqueContentTypeOrder = [System.Collections.Generic.List[Microsoft.SharePoint.Client.ContentTypeId]] $contentTypesInPlace
         
#Update the root folder
$rootFolder.Update()               
Execute-PnPQuery