@neygo,
Use the CSS code below:
#wpforo #wpforo-wrap .wpfl-2 .head-title{width: 55%;}
#wpforo #wpforo-wrap .wpfl-2 .head-stat-lastpost {width: 18%;}
#wpforo #wpforo-wrap .wpfl-2 .head-stat-views {width: 15%;}
#wpforo #wpforo-wrap .wpfl-2 .head-stat-posts {width: 9%;}
#wpforo #wpforo-wrap .wpfl-2 .wpforo-topic-avatar {width: 8%;}
#wpforo #wpforo-wrap .wpfl-2 .wpforo-topic-info { width: 49%; }
#wpforo #wpforo-wrap .wpfl-2 .wpforo-topic-stat-lastpost {width: 18%; }
#wpforo #wpforo-wrap .wpfl-2 .wpforo-topic-stat-views {width: 11%;}
#wpforo #wpforo-wrap .wpfl-2 .wpforo-topic-stat-posts {width: 14%;}
#wpforo #wpforo-wrap .wpfl-2 .wpforo-topic-head div {font-size: 12px !important;}
The CSS codes should be added in the "Custom CSS code" textarea, located in the Dashboard > Forums > Settings > Styles Tab.
Please don't forget to delete all caches and press Ctrl+F5 (twice) on the frontend before checking to reload the updated CSS file.