There is a so-called full-screen document viewing mode, upon switching to which the working area of the document expands to the size of the active area of the computer screen. Switching to full-screen mode is carried out by clicking on the icon with the full-screen image in the Book view modes group of the View tab.
After switching to full-screen mode, the document will look as shown in fig.
In this mode, only the title bar of the document display and the cell indication fields. To exit the full-screen mode, press the <Esc> key or click on the central system icon to switch to the partially open window mode on the right side of the document title bar.