You can use the CSS code below: 

#wpd-post-rating .wpd-rating-wrap .wpd-rating-value .wpdrc{
    display: block !important;
}
#wpd-post-rating .wpd-rating-wrap .wpd-rating-value{
     display: flex;
     justify-content: center;
      padding-top: 0 !important;
      align-items: center;
}
#wpd-post-rating .wpd-rating-wrap .wpd-rating-value .wpdrv, #wpd-post-rating .wpd-rating-wrap .wpd-rating-value .wpdrc{
    font-size: 15px !important;
    padding-top: 0px !important;
}

span.wpdrv:after {
    content: '/';
}

Insert the code in the "Custom CSS code" textarea, located in the Dashboard > wpDiscuz > Settings > Styles & Colors admin page.

On the rating fields before the comment thread, by default it displays the average rating, and the numbers of votes on hover. I think it's not really user friendly and would like to display both by default. It means average rating and numbers of votes next to it. 

Can you please suggest how to do it? 

Thanks.