Kalzium has many configuration options, which you can access by opening the configuration dialog by selecting from the menu.
The Color Scheme tab allows you to choose your Color Scheme (No colors, Groups, Blocks, State of matter, Acid behavior).
In the Colors tab, you can change the different colors for each scheme.
in the Miscellaneous tab, you will be able to choose if you want the More Information dialog on left click (default) or right click. You can also choose the units. You can select if you prefer kJ/mol by default but you can choose eV and the Temperature is in Kelvin by default but you can change to degrees Celsius or degrees Fahrenheit.