Large Text Cells 

You can type a string of text of unlimited length directly into a large text field. In the Record Detail tab, large text fields are multi-line edit cells (figure below).

A large text field is like a text block field except that it is not stored in a separate table. This is useful when you know that a text field value will never be shared by multiple records.

Since Tab (which normally moves from cell to cell in the Record Detail tab) inserts a tab into the text in a large text cell, press Ctrl + Tab to move to the next cell. Similarly, since Enter (which normally ends an edit and closes a cell) inserts a new line into the text in a large text cell, press Ctrl + Enter to end the edit and close the cell.

To change the row height of the cell, drag the row splitter up or down.