This example shows how to show the report designer in the full screen mode by default. In the full screen mode, the designer will be displayed on all of the available area of the browser window. To enable this mode by default you need to set the fullScreenMode option in the StiDesignerOptions object:
// Set full screen mode for the designer
var options = new Stimulsoft.Designer.StiDesignerOptions();
options.appearance.fullScreenMode = true;

// Create the report designer with specified options
var designer = new Stimulsoft.Designer.StiDesigner(options, "StiDesigner", false);

In the screenshot below you can see the result of the sample code:

Full Screen Mode in Designer