Responsive Nature of Excel Ribbon
Excel Ribbon is responsive in nature. Excel Ribbon changes its size according to the size of the main Excel window to make use of available screen space efficiently.
When the size of the main Excel window is reduced, the buttons in Excel Ribbon will start to align vertically. When the size of the main Excel Windows is further reduced, most of the buttons will become hidden under a down arrow button.
Becasue of the responsive nature of Excel Ribbon, the Ribbon on your computer's Excel program might look different than the screenshots in omnisecu Excel tutorials.