If your current circumstances do not permit using an entire room as a library, it is most likely that the living room will have to carry on the same functions: storing books and media, and providing a convenient area for reading and occasional writing. Here I have gathered a few designs suitable for a living room / library. My favorite is the design with the columns. They separate two areas of the living room: the sitting space and the library.
See also:
Architectural columns in home decor