How to change the width and the color of the bar in the bar chart?

Hi,

It’s really not documented correctly. Please try this:

    lv_obj_set_style_pad_column(chart, 0, LV_PART_ITEMS);   /*Space between columns of the same index*/
    lv_obj_set_style_pad_column(chart, 0, LV_PART_MAIN);    /*Space between columns of the adjacent index*/

If it works well for you, I’ll update the docs.