From the Components menu, you select the desired component tab. The menu contains the same items as the vertical tab row with icons to the right of the currently selected component menu.
When the Office/Home tab in the horizontal row is selected, these are, from top to bottom: Line Drawing 1, Line Drawing 2, House Components, Tools, Import and Export, Accessories, Office Desks and Chairs, Storage, Kitchen and Bathroom.
When the Industry tab in the horizontal row is selected, these are, from top to bottom: Line Drawing 1, Line Drawing 2, House Components, Tools, Import and Export, Accessories, Industrial Shelving, Industrial Racks and Conveyors.