Why the open fourth side does the work
A U-shape is three rows of chairs with the front left deliberately empty. That gap is the whole design. It gives the facilitator a centre to stand in and walk through, and it means nobody is looking at the back of anybody's head. In a room arranged in rows, a discussion is a series of statements aimed at the front. In a horseshoe, participants address each other, because the geometry makes eye contact the default rather than something they have to turn around for.
The trade is floor space. A U-shape uses the perimeter and wastes the middle, so it holds fewer people than rows in the same room — the layout above seats 22 in the footprint that would take 30 in rows. That is a reasonable price when participation is the objective and a bad one when it is not.
Building it around your actual room
- Set the arm lengths independently. Rooms are rarely symmetrical. Give the wall side more chairs than the window side if that is what fits — change each row's seat count in the side panel.
- Rotate the arms. The two sides are rows turned 90 degrees. Rotate and drag them so the U opens toward the board, the screen, or the door, whichever the room demands.
- Keep the open end genuinely open. Leave room to walk in. A horseshoe you cannot step into is just an awkward set of rows.
- Watch the far ends. Seats at the tips of the arms have the worst angle on a screen and the longest distance to the opposite tip — put your most confident participants there, not your quietest.
- Go double-U past 24. Add three more rows and drag them inside the existing ones. The inner ring keeps sightlines while adding roughly a third more seats.
Print it, or change it every session
For a recurring seminar, name the seats: paste the participant list, assign, and export a PDF for the door. For a workshop that mixes people deliberately, do the opposite — press Shuffle seats between modules so each round puts people beside someone new. The random seating chart generator covers how that draw works.
Teaching a full class instead of a seminar group? The desk arrangement generator starts from rows, pairs, and pods, and the corporate event maker handles training days that need tables rather than bare chairs.