Kiran please help with a plugin – Slide out menu plugin (Categories widget)

Hi Kasper,
Please change following line with bold tag <b></b> for the field esc_attr( $item->name ) in below line or if you want to change the font size customize with style according to your requirement

$output .= "<li class=\"list-group-item".$image_style."\"><a href='".esc_url( get_term_link( $item ) )."'>".$image." <b>".esc_attr( $item->name )."</b></a><div style='margin-top:3px;margin-right:20px;'>".$count."</div>";