Basically, the "Graphical settings" tab provides all the options for modifying the graphics, in colour / font or content. But over the years, as more and more graphics were added, it became very tedious to change each and every one of them. For this reason, options have been created such as the styles, which allow the basic graphic settings (colour / background / font / line view / ...) to be specified as a global setting.
How to use the global settings and how to configure a each graphic individually is covered in a separate topic. Link to: Q-DAS Graphics - General Configuration
