Thanks for using Syncfusion product.
This is a default behavior of the pivot table component. We will consider this as a feature request and we will implement the feature “Show value caption in headers while having single measure” and it will be available in our upcoming Essential Studio 2019 Volume 1 release which is expected at the end of
March 2019. Here is the link to the feature report page https://www.syncfusion.com/feedback/3933