Can I change the font size within a document without changing its funtion? I don't want to change that it is a paragraph element. I would like it to remain as a paragraph entry in the document but change the font to be larger or smaller.
That is not directly possible.
You have to do that as you would do in a html document:
Hi my Community friends! For those who don't know me, I'm a product marketer on the Confluence Cloud team - nice to meet you! For those of you who do, you know that I've been all up in your Co...
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