These tags allow creating content visible only on AMP or only on the non-AMP version of your website. Just wrap content which you want to display only on your AMP version of the website using source code editor in your post:
<publii-amp> This content will display in the AMP page </publii-amp>
If you need to display some content only on normal website use:
<publii-non-amp> This content will not display in the AMP page </publii-non-amp>
Thanks to these tags you can, e.g., hide forms on AMP websites and display button to full version of the website instead of forms.
Additionally, both blocks will get a dedicated border with a label. With it, you can easily recognize them in your post contents.