Slideshow in documents and PDF files
Adding Slideshows in documents and PDF files, as in presentations, to view files in full-screen format (without an interface). The "Start slideshow" button.
Idea discussion. Check comments.
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      Артем С commented Yes. In browsers, for example, you can open files in full-screen mode, which closes when you press the Esc key or hover the cursor over the top of the screen and a pop-up button with a cross appears. 
 The full-screen mode is also implemented in the Okular program, where when scrolling pages, a circle is displayed indicating the number of pages viewed.
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       AdminConstantine
    (Admin, ONLYOFFICE)
 commented AdminConstantine
    (Admin, ONLYOFFICE)
 commentedJust to clarify: do you mean displaying only the document in fullscreen and without any visible interface elements like close button? If you are familiar with a processor that works in such mode, please share a name for the reference. 
