Help Oneplus 3t enable Google Search Bar

[xbroogw1]

I have somehow disabled the Google Search Bar from the home screen of the Oneplus 3t. I am using the oneplus launcher. When I hold down the screen and bring up the customise option, I only have the option for Gestures and Icons. There is no option for the search bar.

Can anyone tell me, how to enable this option again?

Thanks