This command decreases the height of the bottom pane (allows you to see less of the Y-axis) by 1/16th of the total plot height. If the bottom pane is completely closed with this command, the spectrum data retained in memory (including the inverse transform) will be lost. To decrease the height of the bottom pane by a fixed amount, proceed as follows:
In the View menu click on Less Bottom Y.
Choose View Less Bottom Y (ALT, V, B).