List scrolling related

I use list. How can I use LV_ SCRLBAR_ MODE_ When on, only the scroll bar on the right is displayed, and the scroll bar below is not displayed

I deleted ext->scrlbar hor_ draw = 1;

I am using LVGL 7.7.2. I am using a list. When I have more items than what is currently visible in the list, I don’t see a scrollbar. I like to show the scroll ball . Do you know how to do this? Could you please provide a tiny bit of code that does it?