Previous region button: jumps to previous fitted region.
Next region button: jumps to next fitted region. To revise fitted regions one after the other, click this button repeatedly. Alternatively, you can hit the + key on your keyboard.
Scroll bar: scrolls to any spectrum region.
Position edit box, X axis unit changer, Jump button: quick location of a specific spectrum portion is achievable by using these positioning tools. Click the unit changer (labeled with “keV” or “ch”) in order to toggle the unit of positioning between channel and energy, then enter the new position, and hit Enter key or click the green jump button to display the spectrum part around the entered position.