ambari-web/app/templates/common/configs/config_versions_control.hbs

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<div id="config-versions-control">
  {{#if view.isCompareMode}}
    <div class="compare-bar">
      <i class="icon-exchange" aria-hidden="true"></i>
      <span class="compare-label">{{t services.service.config.configHistory.comparing}}:</span>
      {{view App.ConfigVersionsDropdownView
             serviceVersionsBinding="view.primaryServiceVersionsInCompare"
             isCompareMode="true"}}
      <span class="grey-text">{{t common.with}}</span>
      {{view App.ConfigVersionsDropdownView
             serviceVersionsBinding="view.secondaryServiceVersionsInCompare"
             isSecondary="true"
             isCompareMode="true"}}
      <a {{action removeCompareVersionBar target="view"}} class="pull-right close form-text">&times;</a>
    </div>
  {{else}}
    {{view App.ConfigVersionsDropdownView serviceVersionsBinding="view.serviceVersions"}}
    {{#unless view.displayedServiceVersion.isCurrent}}
      <button class="btn btn-secondary make-current" {{action makeCurrent target="view"}}>
        {{t dashboard.configHistory.info-bar.revert.button}}
      </button>
    {{/unless}}
  {{/if}}
</div>