How to solve the problem of videos saving outside the confines of a forum post, with the wpForo Embeds Add-on

The following solution worked for me:

navigate to Dashboard > Forums > Settings > Styles admin page, add the following CSS code in “Custom CSS code” textarea, save it, delete all caches and check again (press CTRL+F5):

#wpforo-wrap .wpf-right .wpforo-post-content .tie-fluid-width-video-wrapper {
clear: none !important;
}

Solution provided by wpForo support