Unable to change window title prefix Home-Grafana

This problem is related to grafana 6.
I want to change window title Home-Grafana to Home-“My Text”. I tried Changing in config.ts

windowTitlePrefix: 'DIY Dashboard - ',

I re run the npm start but it still change is not reflecting.

Can anyone tell am i changing in right file or there is something wrong with the process i am using.