If you have used character adaptation to tell MoboMath how you write particular characters, you can review your list of adapted characters at any time using the "Show adaptations" item in the Grammar menu. This will display the Adapted Characters dialog.
For each adapted character, the dialog shows you the character or its name and a corresponding sample of your writing. You can tap an entry to select it, as shown for the + sign above. If you want to delete the selected adaptation, tap the Remove button. This will delete any samples that you entered earlier for the character and revert the character to its standard recognition.