Suggestion

Bring back the symbols option, like registered ®, trademark and copyright(IP symbols), instead of emojis like they are currently in the fabric editor.
Currently is not possible to use those like it was in tiny editor(it was smaller). Symbol are bigger in fabric (as they only have the option to be inserted as an emoji) and superscript does not work with it.

Workaround

On macOS, type CTRL + CMD + Space. An emoji pop-up will display. You can select >> in order to expand the menu and reveal non-emoji symbols which can be used in your page.

On Windows, open the Character Map and use it to find and insert your symbol. It will also teach you the proper key combination to use in case you want to type the characters quickly in the future. For more information, watch the video How to Use Character Map in Windows 10 / 8.1 / 8 / 7 / XP Tutorial.