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:
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.