I am not getting all the records for a record type relationship

I have a Class record type and a Student Record type with a relationship between them one-to-many.

when I try to get a Class with all the students (every student contains classId) I get only 10 of them but I have much more.

how can I fix it? 

  recordType: 'Class',
  fields: {
  filters: a!queryLogicalExpression(
    operator: "AND",
    filters: {
        field: 'Class.Id',
        operator: "=",
        value: ri!id
    ignoreFiltersWithEmptyValues: true
  pagingInfo: a!pagingInfo(
    startIndex: 1,
    batchSize: 100

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