Set these options to control how Screen Writer Studio operates. These options set how heavy (bold) the font will be. The font displayed is the default font. This may be different than the font you have assigned to each paragraph style. Each font will be set to the weight you assign here, which may look different for different fonts. In addition, the printer fonts may look different when printed.
You cannot adjust the weight for each font you use in various paragraph styles. These are settings which are applied the same to each font. (What is actually happening is the slider sets a numerical weight and that weight is used when each font is created.)
Click on the control you want more information about.
