There is no explicit way to suppress the output. However, you can easily achieve this by moving the helper declarations in an outer (or nested) object.
For instance, the following would do it:
object worksheet {
object helper {
val sqs = scen.rssis.toSeq.filter { case (ap,s) =>
s.exists(e => e.epoch > 1) }.sortBy { -_._2.length }.take(10)
}
helper.sqs foreach { case (api,s) =>
println(f"${scen.aps(api).ssid}%-10s ${s.length}% 5d")
}
}