Changing a comment shape

When a note is inserted in a cell, the little red triangle is displayed:

Usually, when you add the note, it has a rectangular shape, but you can give the cell note any form you want:

To change the shape of a cell note, add a command to your Quick Access toolbar (see Adding commands to the Quick Access Toolbar):

   1.   To the right of the Quick Access toolbar, click the tiny arrow button to open the drop-down menu:

   2.   Near the bottom of the menu, click More Commands....

   3.   In the Excel Options dialog box:

• From the Choose commands from drop-down list, select Drawing Tools | Shape Format Tab.
• From the list on the left, select Change Shape and then click Add >>:
  

   4.   Click OK to close the Excel Options dialog box.

After performing these steps, your Quick Access toolbar has a new Change Shape icon:

To change the shape of a note, do the following:

• Ensure that it is visible (for example, by right-clicking the cell and selecting Show/Hide Comments).
• Click the note's border to select it as a Shape (or, Ctrl-click the note to select it as a Shape).
• Click the Change Shape button on the Quick Access toolbar and choose a new shape for the note box:

See also this tip in French: Comment changer une forme de commentaire Excel.