Is it possible to have an "undo" function please? I so often accidentally delete stuff and have to retype it.
Aside from using the Undo function on your computer (Command+Z on a Mac, Ctrl+Z on Windows), what are you looking to undo that that doesn't work for?
The first thought that comes to mind is that I do the same thing and so use the Undo function, which is Command+Z function on a Mac, or Ctrl+Z on Windows. Further, Command+Shift+Z (Ctrl+Shift+Z) on a Mac (Windows) would redo stuff on Socratic.
Which leads to my second thought, which is you probably know this and use it... which means I don't understand the question.