Explanation

The Shortcut Ctrl+Z is used to undo the last action in a document.

Additional Information:

Crtl + U is a shortcut key used to underline text.

Crtl + D is used to open the font preferences window.

Crtl + X is used to cut selected text and save it to a clipboard ready to paste elsewhere.

Crtl + Y is used to redo the changes or actions made in a document.