Disabling desktop screen at start up in chromium kiosk

I am working on an nodered dashboard in which i am using chromium in kiosk mode .Every thing is working fine except that chromium is starting 3-5 secs after desktop screen appears .I dont want to show the desktop screen to user but only chromium ui.
Pls help!! my raspberry is 3.
I'V used this link for kiosk mode:Raspberry Pi Kiosk using Chromium - Pi My Life Up

Probably a Pi forum would be a better place to ask this. It does not appear to be a node-red related question.

thanks a lot :wink: