Some questions about tabview?

hi, i have some questions in my project.
i follow the “demo” project, then i have some questions shown below:
1.Can I set the size of button in the tabview? Like in the top of the picture I uploaded, how to
set size of the button in the tabview? Because I want set the buttons on the left, but after I used the function lv_obj_set_size(), I found the button is too small, so I want to enlarge it.
2. How to change the color of the bar I circled in the picture? bar

my code is shown below:

/*\brief Create a tabview
 *      创建左侧垂直标签
static void create_tabview(lv_obj_t* parent, lv_coord_t hres, lv_coord_t vres)
    /* 设置tabview的button背景样式 */
    static lv_style_t style_tv_btn_bg;
    lv_style_copy(&style_tv_btn_bg, &lv_style_plain_color);
    style_tv_btn_bg.body.main_color = LV_COLOR_BLACK;
    style_tv_btn_bg.body.grad_color = LV_COLOR_BLACK;
    style_tv_btn_bg.body.opa = LV_OPA_30;
    style_tv_btn_bg.body.radius = 0; = 0;
    style_tv_btn_bg.body.padding.bottom = 0;
    style_tv_btn_bg.body.padding.left = 0;
    style_tv_btn_bg.body.padding.right = 0;

    /* 设置tabview的button释放样式 */
    static lv_style_t style_tv_btn_rel;
    lv_style_copy(&style_tv_btn_rel, &lv_style_plain_color);
    style_tv_btn_rel.body.main_color = lv_color_hex(0x41A920);
    style_tv_btn_rel.body.grad_color = lv_color_hex(0x41A920);
    style_tv_btn_rel.body.opa = LV_OPA_COVER;
    style_tv_btn_rel.body.radius = 0;
    style_tv_btn_rel.body.border.width = 0;
    style_tv_btn_rel.text.color = LV_COLOR_WHITE;

    /* 设置tabview的button按下样式 */
    static lv_style_t style_tv_btn_pr;
    lv_style_copy(&style_tv_btn_pr, &lv_style_plain_color);
    style_tv_btn_pr.body.radius = 0;
    style_tv_btn_pr.body.opa = LV_OPA_50;
    style_tv_btn_pr.body.main_color = LV_COLOR_WHITE;
    style_tv_btn_pr.body.grad_color = LV_COLOR_WHITE;
    style_tv_btn_pr.body.border.width = 0;
    style_tv_btn_pr.text.color = LV_COLOR_WHITE;

    /* 创建tabview */
    lv_obj_t * tv = lv_tabview_create(lv_disp_get_scr_act(NULL), NULL);
    //lv_tabview_set_btns_pos(tv, LV_TABVIEW_BTNS_POS_LEFT);
    lv_obj_set_size(tv, hres, vres);

    lv_obj_set_parent(parent, ((lv_tabview_ext_t *) tv->ext_attr)->content);
    lv_obj_set_pos(parent, 0, -30);
    /* 分别创建标签页 */
    lv_obj_t * tab1 = lv_tabview_add_tab(tv, "主接线图");
    lv_obj_t * tab2 = lv_tabview_add_tab(tv, "事件记录");
    lv_obj_t * tab3 = lv_tabview_add_tab(tv, "装置状态");
    lv_obj_t * tab4 = lv_tabview_add_tab(tv, "参数设置");

    lv_tabview_set_style(tv, LV_TABVIEW_STYLE_BTN_BG, &style_tv_btn_bg);
    lv_tabview_set_style(tv, LV_TABVIEW_STYLE_INDIC, &lv_style_plain);
    lv_tabview_set_style(tv, LV_TABVIEW_STYLE_BTN_REL, &style_tv_btn_rel);
    lv_tabview_set_style(tv, LV_TABVIEW_STYLE_BTN_PR, &style_tv_btn_pr);
    lv_tabview_set_style(tv, LV_TABVIEW_STYLE_BTN_TGL_REL, &style_tv_btn_rel);
    lv_tabview_set_style(tv, LV_TABVIEW_STYLE_BTN_TGL_PR, &style_tv_btn_pr);


/*\brief Create a display
 *      创建一个GUI显示
void display_create(void)
    lv_coord_t hres = lv_disp_get_hor_res(NULL);
    lv_coord_t vres = lv_disp_get_ver_res(NULL);

    lv_obj_t* wallpaper = create_wallpaper(hres, vres);

    create_tabview(wallpaper, hres, vres);

Next time please format your code blocks using ```c and ```.

ok , can u solve my problem?

The bar that you circled in the picture called indic.

You must create another static lv_style_t style_indic and change color to this style,
and set it by

lv_tabview_set_style(tv, LV_TABVIEW_STYLE_INDIC, &style_indic):