In the series Babylon 5, we are mostly shown the small cramped rooms and corridors of the eponymous space station, very full of people and things. There are episodes like the one where they host a lot of ground troops and people have to triple or quadruple up in quarters; or the one where several priests want to give a shared religious service for lots of the aliens and "we don't have much space, but you can use the chapel". (Or the large baseball practice field, says no-one)
But when we do see inside the central area it is a vast O'Neill cylinder type structure with lots of fields.
I guess the out-of-universe answer they don't use it much is because the special effects at the time couldn't handle it. But is there an in-universe reason they don't make a lot more use of this space? The map in this question calls them hydroponics gardens, so are they perhaps all watery paddy fields it wouldn't be practical to wander around in?
I certainly wouldn't like living in most of the rooms & corridors, but the interior looks like it'd be amazing and gorgeous to be inside.
This answer to a different question shows a good picture and has quotes saying
In a piece originally written on GEnie and archived on the excellent Lurker's Guide website, J. Michael Straczynski describes the station as being;
"...patterned physically after the work of such scientists as Gerard K. O'Neill"
with the central core of the station containing a
"hollow-world look, with fields and hydroponic gardens along the 360-degree circular section (which is about a half-mile, or a mile across)...This area is known as the Garden."