Photo Mate allows you to customize your editing interface.
Go to Menu -> Histogram to choose the Histogram mode or to disable it
Use the to unlock the bar from the top.
Long-Tap on an heading (like "Basics") to re-order the tools.
Note: You should close all tools first by tapping once on each of the headings
Go to the "Tools" heading and use the "Sidebar Size" slider to adjust the width of the tools section