First of all, if you already use assigned seating for behavioral issues, then yes, you probably should use them for seminars. This is especially true for larger classes where you will want to strategically think about how to split the class into two groups for an inner and outer circle. Remember that specific positions in the formation such as next to and across from are usually the most troublesome.
If you normally use assigned seating, consider letting the students decide where they want to sit for seminar. This could pose the first potential problem for the students to solve over the course of the next several seminars. If the first seminar goes smoothly, then the students already made good choices. If the seminar does not go well, debrief with the students about what happened. They may even recommend having assigned seats.
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