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The Script Editor web part is a Powell 365 web part.
This web part allows you to integrate a specific code into your intranet page. This way, you won't be restricted to integrate the features you want to execute on your Intranet portal. You'll be able to personalize and add whatever you need to your pages.
The nature of your code will determine the display.
Future evolution will permit the web part to be editable directly from your Sharepoint site. But in the actual state of Powell365, it's not yet possible, you'll have to configure it from Powell Manager.