KRKeerthana Rajendran Syncfusion Team December 5, 2019 11:11 PM
Thanks for contacting Syncfusion support.
We have checked your reported problem in TreeView component with your shared code. You have assigned fields settings inside the render method and because of this the component was re-rendered every time we make a change using setState method. To resolve this issue, give the fields settings outside of the render method. We have prepared sample for your convenience. kindly refer to the below link for the sample.