Do think through seating choices and arrangements so that the design appears well-designed and promotes dialogue. Select bits sized to your room do not overwhelm a small space using an oversize sectional, by way of instance, but also do not pick chairs so small they seem missing in a massive room.
To improve seating capability with no overcrowding, include ottomans in your grouping; they double as a place to put feet up and as impromptu, portable seating. Last, do not shove seating against the walls. Instead, float a dialog grouping to the center of this room and place seating so everyone can see and hear each other.