We know that OneNote itself provides tags capabilities.
However, these tags apply only to paragraphs, which are paragraph-level. Not at the page level.
If you place these tags on the page title, they cannot be displayed in the list of pages.
Gem Menu for Mac OneNote now provide Page-Level Tags.
In Gem Menu for Mac OneNote, click “Page Title Tags” menu, in here list some Page-Level tags.
When you click on these tags, it inserts the tag at the front of the page title.
We will find that these tags are displayed in the OneNote page List pane.
The advantage of page-level tagging is that it appears in the OneNote page List pane.
We do not need to open the page; we probably know what the page contains, based on the tags.
Seeing the "Heart" tag, we know that this is an important page.
Seeing the "Mail" tag, we know that this is a page that is imported from the message.