@wahyuesgroup,
Please remove the previous CSS code and use this one instead:
@media screen and (max-width:800px) {
#wpforo #wpforo-wrap .wpfl-2 .wpforo-post .wpf-left {
width: 156px;
float: none;
}
#wpforo #wpforo-wrap .wpfl-2 .wpforo-post .wpf-right {
margin-left: 10px!important;;
float: none;
flex-grow: 1;
}
#wpforo #wpforo-wrap .wpfl-2 .wpforo-post{
display: flex;
justify-content: space-between;
align-items: flex-start;
}
#wpforo #wpforo-wrap .wpfl-2 .wpforo-topic-meta .wpforo-post{
display:block
}
}
Save it, delete all caches, go to forum front-end and press Ctrl+F5 to reset the browser cache.