zuel-itsm-3.0.2/assets/views/customform/tpl/ui-isteven.html

<div
  isteven-multi-select
  input-model="webBrowsersGrouped"
  output-model="outputBrowsers"
  button-label="type"
  item-label="type"
  tick-property="ticked"
  group-property="msGroup"
  output-properties="type ticked id" 
  helper-elements="all none" 
  translation="localLang" 
  max-height="250px"
  on-close="fClose()"
  on-item-click="fClick(data)"
  on-select-all="fSelectAll()"
  on-select-none="fSelectNone()" 
  style="height: 30px;"
></div>
<style>
    .multiSelect > button{
        max-height: 38px!important;
        overflow: auto;
    }
</style>