Legend frames are resizable to help you create the legend layout that you want. This may be useful when working with columns (see Changing the Number of Columns in a Map Legend Frame).
To resize a legend frame in the Legend Designer window, position the mouse over a corner or an edge of the legend frame to change the mouse cursor, and then click and drag the corner or the edge to a new position. The label text column will wrap (or unwrap), if necessary, to accommodate the changing frame width.
Thematic legends may be shared across different types of windows. Changing a thematic legend frame (to introduce columns), changes it in all the windows that include the thematic legend frame.