Here's a bit of a roundabout way, but that works. But you'll def need a mouse/trackpad paired via lighting…
1 - Try to get to any text field (the earlier one is in Written and Spoken Languages > Customize Settings > Add (+) > User that search field)
2- Two-fingers click to show a menu. Then go to Substitutions > Show Substitutions > Text Preferences…
3 - A System Preferences window should open.
4 - From there you should know what to do.