How to change chart bar width?

I have a problem with bar type chart in lvgl 8.
please help me how to change the tickness of rectangle bars in the chart

Hi you can try this:
static lv_style_t style_scrollbar;
** lv_style_init(&style_scrollbar);**
** lv_style_set_width(&style_scrollbar, 18);**
** lv_style_set_bg_opa(&style_scrollbar, LV_OPA_COVER);**
** lv_style_set_bg_color(&style_scrollbar, lv_color_hex3(0xeee));**
** lv_style_set_radius(&style_scrollbar, 0);**
** lv_style_set_pad_right(&style_scrollbar, 4);**

** lv_obj_set_scrollbar_mode(chart, LV_SCROLLBAR_MODE_ON);**
** lv_obj_add_style(chart, &style_scrollbar, LV_PART_SCROLLBAR);**