Site template: How to make a Content Type a default one?

So the main issue is setting default content type isn't supported by Site script so you need to do it via trigger a flow and using HTTP apply it 😊

I wrote a blogpost exactly about this a month ago, you should be able to flow it and modify it to your needs!:

https://yourmodernworkplace.com/blog/Setting-default-Content-type-Using-Flow

Hello Hammed,

Thanks for the reply.

Yes, I know about this :) but what I wish to do this trough the "Site Script" not manual process.

Configure the Default Content Type

1. After enabling https://support.microsoft.com/en-us/office/add-a-content-type-to-a-list-or-library-917366ae-f7a2-47ad-87a5-9689a1884e60#:~:text=be%20available%20shortly.-,Go%20to%20the%20settings%20for%20the%20list%20or%20library.,Then%20select%20OK., go back to the Library Settings page.
2. Locate the Content Types section (refer to Screenshot 1). Here, you’ll see a list of content types associated with the library.

• If your desired content type is not listed, click Add from existing site content types to add it.

1. Once the desired content type is visible:

• Click Change new button order and default content type (circled in Screenshot 1).
• On the following page (refer to Screenshot 1 and Screenshot 2):
• Adjust the Position from Top to place your desired content type at the top.
• Ensure the “Visible” checkbox is selected for all necessary content types.
• Click OK to save changes.