Turn scripting capabilities on or off in Office 365 SharePoint Online

To enable or disable scripting from the SharePoint admin center

1. Sign in to Office 365 with your work or school account.
2. Go to the SharePoint admin center.
   
3. Select Settings.
4. Under Custom Script choose:
   • Prevent users from running custom script on personal sites or Allow users to run custom script on personal sites.
   • Prevent users from running custom script on user created sites or Allow users to run custom script on self-service created sites.
   
5. Click OK. It takes about 24 hours for the change to take effect.

To enable or disable scripting on a different SharePoint collection

The Custom Script feature enables or disables scripting capabilities on SharePoint Online personal sites and self-service sites. Because self-service site creation points to your tenant’s root site collection by default – you’re actually applying the scripting capability to your tenant’s root site collection. If you don’t want this and instead want to enable or disable scripting on another site collection, you can point the self-service site creation root to another valid site collection in Office 365.

Any change to the scripting setting made through the SharePoint Online admin center may take up to 24 hours to take effect. To enable scripting on a particular site collection immediately, use the following PowerShell command (learn more about the SharePoint Online Management Shell):

Set-SPOsite <SiteURL> -DenyAddAndCustomizePages 0

Make sure the scripting setting in the admin portal matches what you set using PowerShell, or the site collection setting may be overridden again in the next 24 hours.