When you choose superscript, a predefined baseline shift value and type size is applied to the selected text.

1. Highlight the text you wish to change or if it is the whole content of the text box, select it and click the Superscript field from the text editing toolbar.

https://cdn.elev.io/file/uploads/Nx6j1ilgYkjKwwUzxKv9Jx2yWyIGUZG4VbEE9W71H30/l2uDkHmSwx-z5x9soDOkB_2c1Rj6S9VPwwDDa1Q9hUg/changing superscript.fw-Q9c.png

2. Save your page when you're done or continue editing.