RMB Click the note and open the Autofit dropdown
menu.
Choose one of the following options:
Do not autofit: The text box adjusts to the size of the text and
grows as you type. There is no blank space around the note and making
the text larger or smaller adjusts the box accordingly.
Resize text height on overflow: The text always fits the width of
the box. If you make the box wider, text from the second line will move
up to the first line.
Shrink text on overflow: The text adjusts uniformly (width and
height) and scales to fit in the text box.
Shrink text horizontally on overflow: The width of the text
changes but the height remains the same.