Rotor 3D Viewer's main window shows the application menu and toolbar, your selected 3D model and the Explorer panel. 

The View menu lets you choose the components to have visible in the application's main window: Toolbar, Tab panel, Models library. 

The Options menu allows you to customize the application's appearance and behavior according to your needs and preferences. 

The 'Manage library' window shows a list of your available 3D models and also a list of the music. You can add or delete files to the lists. 

The Mesh list panel enables you to remove elements from the current 3D model that is rendered in the main window.