When you promote a modern page as a news post page, you won’t lose any functionality:
We cannot change a News post page back to a site page, as a workaround, if we want to create a page from existing news post, we'll have to create a page template based on your news post, and then create a page using that template.Here's how:
- Go to the posted news post that you want to change into a page.
- On the top left, select Promote.
- In the panel that opens on the right, select Save as page template.
- Go to the home page for your site.
- Select New at the top of the page, and then select Page.
- Select the template you saved in Step 3.
- Save and publish the page.
More information for your reference:
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