@marios,
Insert the below CSS in Custom CSS Codes Field From Dashboard > Forums > Settings > Styles Tab:
#wpforo #wpforo-wrap .wpforo-right-sidebar #wpf-widget-search .wpforo-widget-content form {
display: flex;
}
#wpforo #wpforo-wrap .wpforo-content .wpf-navi.wpf-navi-topic-top .wpf-navi-wrap {
display: flex;
justify-content: flex-end;
}
#wpforo #wpforo-wrap .wpforo-content .wpf-navi.wpf-navi-topic-top .wpf-navi-wrap span {
line-height: unset
}
#wpforo #wpforo-wrap .wpforo-content .wpf-navi.wpf-navi-topic-top .wpf-navi-wrap select.wpf-navi-dropdown.custom-select {
width: 40px !important;
height: 24px !important;
padding: 0px 5px !important;
margin: 0px 2px !important;
}
I guess your theme is the problem maker, before using this CSS, try changing the theme.