Right-click within the Horizontal Profile view window.
Select "Fit to Image".
Move mouse cursor and double-left-click to establish left-side boundary.
Move mouse cursor and double-left-click to establish right-side boundary.
Then click ok.

Right-click within the Horizontal Profile view window.
Select "Fit to Image".
Move mouse cursor and double-left-click to establish left-side boundary.
Move mouse cursor and double-left-click to establish right-side boundary.
Then click ok.