The only way i can think of is to use a THEME with left sidebar and use the theme's sidebars for wpForo widgets (instead of wpForo sidebars).

CSS. Something like:

#wpforo #wpforo-wrap .wpforo-content {
width: 80%;
float: right;
padding: 0px;
box-sizing: border-box;
}

#wpforo #wpforo-wrap .wpforo-right-sidebar {
width: 17%;
float: left;
padding: 0px 0px 0px 0px;
box-sizing: border-box;
}

Hi @ikeduru4,

I'd also recommend using thems's left sidebar instead of wpForo sidebars. 

However as @verek mentioned you can reach this using CSS code. Just add it in "Custom CSS code" textarea located in Dashboard > Forums > Settings > Styles admin page. This CSS code also should change the positions of the elements.

.wpforo-main.wpft-forum {
   display: flex;
   flex-direction: row-reverse;
   justify-content: space-around;
}