How to disable DatePicker

I am using nebular in my angular project and i want to disable datepicker. I am not able to find how to disable datepicker control.

angular/cli version 8.3.25
npm version 6.13.4

I want to disble datepicker when someone doesn't have access but not sure how to achieve it.

My code
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I have found method **hidePicker** in datepicker documentation but not sure how to use it to hide picker?