This New Feature added in OPNBI
1. to do so, go to widget edit > there is a checkbox on the left side bottom of the edit window named 'Disable Pivot Drill Data'
2. This is by default enable so the drill is working by default.
3. to disable the drill, just uncheck this checkbox and go to settings tab > go to Misc > uncheck hide the icon in preview option.
4. save it and go to preview and click on any Data of pivot, it won't open detailed data.