Usally I read pdf documents that have long filenames.
This is problem with the favorites right side window because it writes the filename first and then the favorite description I wrote. The result of this behavior is that I cannot see the description.
Possible solutions:
Sections per book: Write the book in one line and then in the subsequent lines the favorite descriptions for that book.
Compress the filename with ... making sure that the favorite description is shown.
From https://forum.sumatrapdfreader.org/t/problem-with-favorites/148/1: