Choose File > Options > Objects.

 

§ The "Select" button under "Object font" lets you choose the default font to be used for objects.

§ Under "Color preferences", you can specify the border and the filling for objects.

 

By default, the "preset" is activated for the various object properties (e.g. Font.Size, Font.Bold, Font.Color). Hence, if a preset is changed at a later point in time, this will affect all properties for which the font was not manually changed. To increase the size of the font by 2pt as compared to the preset, select "+2" as the value for the size, or correspondingly "-2" to decrease the font size by 2pt.

When you start a new project, it's a good idea to configure these settings using suitable values to keep the effort required for making manual changes to a minimum. The settings only apply for the current project.