Undo and Redo

Undo cancels the previous change.
Redo cancels the previous undo.

Standard toolbar indicating Undo and Redo buttons

I made a mistake. How do I change it back?

  1. Click Undo button

For example:

Type: I live in Halifax.
Change the font size: I live in Halifax.
Undo: Undo button I live in Halifax.
Redo: Redo button I live in Halifax.
Type: I am from Mexico.
Change the font: I am from Mexico.
Undo: Undo button I am from Mexico.
Redo: Redo button I am from Mexico.