Use the setting named Color Theme to change the program's overall appearance. Several themes are available. You can also set the Editor background color, Thumbnail background color, and Thumbnail style.
Here you can also tell the program not to Highlight module switcher buttons.
Use the Toolbars group to choose an Icon size from among these two options: Normal Icons and Large Icons. Underneath these options is a Preview of how toolbars will look with your settings.
Click Change Toolbar Settings… to call up a window for customizing toolbars' contents.
The Zoner Photo Studio window always shows a title bar at the top if you turn off the option named Hide program's title bar when maximizing window.
Use the Optimize interface for touch devices option to change Zoner Photo Studio's interface (mainly the sizes of certain controls) so that it is easier to use with touch controls.