Many owners of sectionals use all of the pieces together in the most obvious configuration, which is an "L" shape. However, provided the room contains ample space, the "L" can be positioned in a number of ways. One side (or back) of the sectional can follow a wall, with the other side protruding into the room. Or the sectional can be pulled a few feet away from the wall with a sofa table against its back or against the wall. The whole sectional can also float near the center of the room with open space around its entirety. To make a more interesting arrangement in a large room, the sectional can sit at an angle within the area as long as there is plenty of space for traffic around it.
A quality sectional is upholstered on all surfaces, including those not seen when the sectional pieces are pushed together. A conversation grouping can be made by placing two sections opposite each other with a coffee table between them. The two sections can be equal in size or not and my or may not have arms. Another piece that may be available from the sectional, such as an armless seat, can serve as a chair and be positioned with the conversation group.
A sectional can have logical breaks between sections at points of architecture. For example, a sectional following along a wall can break at a window instead of blocking it, and then continue on the other side. The same technique can be used when there are large columns or one or more alcoves in the room. The use of tables and accessories (and rugs where appropriate) demonstrate this arrangement as a style choice, not an accident.
The individual pieces of a well-made sectional can be used separately and arranged as though they are sofas or chairs. Place a three-seat section as you would a sofa and a two-seat section as you would a loveseat. A chaise lounge, or a single seat piece with a bumper or ottoman, can be used to create a reading area in a corner. Complete each seating area with its own lighting.