What key should i press to leave the cell as it orginally was

Pressing the Escape key is used to leave the cell as it originally was

Explanation:

While working on Microsoft Excel, If one has activated the cell and have entered some data and wish to go back, pressing the Escape (Esc) key can be used. On the other hand if one has entered the data and just want to go back (or undo) pressing the Ctrl + Z is used to undo action and return to original value.