Questions about the theme editor

Hi, Vital forum users.
I have been making a bunch of themes recently, and I noticed that when I click delete while i am changing a value in the Edit Theme Values section, it deletes the whole value from the entire equation. Is there a way to undo this, other than just reloading the last saved version of the theme?

Similarly, when I delete a color in the Edit Theme Colors section, I can’t seem to undo that either. Is there a workaround?

-Dr. Printer