When you use Notebooks in Column View (the default), the list of books and documents is shown in the left frame, the selected document in the right. If you want to view the document full screen you can quickly hide
How can I Activate Phone Numbers to be Called from Notebooks?
Phone numbers, URLs, email addresses, addresses and calendar events can be shown as clickable links in Notebooks’ documents. Most of these links are disabled by default to keep the text readable, but you can selectively activate each of them in
Where is the Ruled Background in Formatted Documents?
Formatted documents – in contrast to plain text – use uneven line spacing. A header line, for example, is higher than a line in a regular paragraph. Displaying that uneven text on an evenly ruled background does not look good,