Dear Support Team ,
How can I setup font size in page content ? Thanks a lot.
On the page you can't. You need to edit either the global or space stylesheet (CSS). The docs are here: Styling Confluence with CSS.
Typically, I create a custom stylesheet for each client to style their Confluence instance more in keeping with their corporate branding.
You can change local style by creating a user macro to wrap you content in either CSS class or inline CSS.
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