You can restore the size of minimized comments by using either of the following methods:

Method 1 (restoring the size of a selected minimized comment)

Select and right-click a minimized comment, and then select Restore the size of comment.

Method 2 (restoring the size of all minimized comments in the canvas)

With no activity selected, right-click anywhere in the canvas, and then select Restore the size of all comments.