Can I change the text size of words in the article description or step instructions?
Clarify does not provide a way to independently change the size of words within the article description or step instructions. The size of the text as a whole is determined by the format you are exporting to. For example, the PDF template determines the size of the text when exporting to PDF. The CSS on a WordPress site determines the size of text when you export to WordPress and so on.
You can, however, change the overall size of the text in the Clarify document editor.
Changing the size in the editor
From the General preferences pane you can choose the relative size of text in the document editor. Note that this will not change the size of text when you export, just while editing.