How to sort complex list

Are you querying this from a database via a QueryEntity rule? If so, you can easily sort on a particular field via your a!pagingInfo() definition.

If it's data you have inherent or manually-created in an interface or a rule, then it takes a bit more work.  Appian has no direct way to do this but a fairly easy indirect workaround, again involving pagingInfo.

a!localVariables(
  local!dictionary: {
    {
      clientId: 1,
      clientName: "z client 1"
    },
    {
      clientId: 32,
      clientName: "a client name"
    },
    {
      clientId: 58,
      clientName: "middle client"
    }
  },
  
  todatasubset(
    local!dictionary,
    a!pagingInfo(
      startIndex: 1,
      batchSize: -1,
      sort: a!sortInfo(
        field: "clientName",
        ascending: true()
      )
    )
  ).data
)