The size and shape of the font can be adjusted through visual themes, which are available in the 'EDIT' - 'Design' tab.
Each theme can be adjusted to your needs. First, select the desired theme, and then click 'Customize' (palette icon on the left below the selected theme). The theme editor allows you to change the size, color and typography of fonts for questions and answers, as well as the background color and frames. You can also insert your own logo.
Theme modification is only available to 2KA and 3KA private package users.