I am asked to removed the arrow of the popover view.
Hiding the popover arrow or showing one popover inside another does not sound very wise. I’m not sure if this is explicitly forbidden by the HIG, but it’s a usability drawback anyway. If you insisted you could draw your own arrowless popover or try to mask the arrow using some view composed on the top of it. I think it would be much better to rethink the UI.