I am trying to delete the remaining content type from the new button in my library. I am getting this error constantly which is weird since I am able to make the changes through the UI. Any help would be appreciated.

        public async Task HideAllContentTypesInNewButtonAsync(ClientContext clientContext, string listTitle, params string[] excludedContentTypeNames)
        List list = clientContext.Web.GetListByTitle(listTitle);
        await list.EnsurePropertiesAsync(toLoad => toLoad.ContentTypes, toLoad => toLoad.ContentTypes.Include(ct => ct.Name));

        var contentTypesToHide = list.ContentTypes
                                     .Where(contentType => excludedContentTypeNames.All(name => contentType.Name != name))

        HideContentTypesInNewButton(list, contentTypesToHide);
        log.LogDebug($"Hiding Content Types on list '{listTitle}'.");

        await clientContext.ExecuteQueryRetryAsync();

enter image description here enter image description here

  • Why would you want to do this? Jan 17 at 10:12
  • We don't create new files we only upload files so the functionality is useless for us. Jan 17 at 10:43
  • I've added an answer which explains how to hide the "New" button. Jan 17 at 12:11

2 Answers 2


If you do not want to display the "New" button, it can be hidden using JSON formatting.

Navigate to the list or document library >> Click on the View dropdown and choose “Format current view” >> Click on “Advanced Mode”

Paste the JSON below to hide the New button from the toolbar.

  "commandBarProps" : {
    "commands": [
        "key": "new",
        "hide": true

enter image description here

Hide a Button in SharePoint Online List or document library Toolbar

  • Thanks for the input but I would like to keep this as a last resort. The only problem with this approach is that I will have to manually do it for each environment. Jan 17 at 12:25
  • I also recommend you hide the "New" button using JSON formatting. In addition, you can use CSS code to hide the "New" button. For reference: learn.microsoft.com/en-us/answers/questions/545423/…
    – Zella_msft
    Jan 18 at 7:17

I've had the same issue but with PowerShell and solved this by removing all content types in the order and then creating a new list.

In this case, i pass the name of the content types in the parameter $order = "ContentTypeA", "ContentTypeB"

# Sets the content type order on list
Function Set-ContentTypeOrderOnList

    $web = Get-SPWeb $webUrl
    $list = $web.Lists | ? { $_.RootFolder.Name -eq $rootFolder }

    if($list.ContentTypes[$order[0]] -ne $null)
        $currentListOrder = $list.RootFolder.ContentTypeOrder

        for($i = $currentListOrder.Count; $i -gt 0; $i--)
            $lct = $currentListOrder[$i]
            $disableoutput = $currentListOrder.Remove($lct)


        $disableoutput = $currentListOrder.Remove($currentListOrder[0])

        foreach($ctToAdd in $order | where { $_ -ne $order[0]})

        $list.RootFolder.UniqueContentTypeOrder = $currentListOrder


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