@strategia,

Try this CSS Code: 

.ast-page-builder-template .site-content > .ast-container{
    max-width: unset;
    padding: unset;
}
@media (min-width: 922px){
.site-content .ast-container {
    display: unset;
}
}

Chris, do you think it's the theme? That code didn't make any difference although I tried it with and without the example custom css that's already in the box.

The funny thing is that the left margin that was somehow still functioning in the Members page has now stopped altogether! The other odd thing is that there is now a couple of pixels of space now showing on the left with and without the new code. huh?

When I play with Inspect, #wpforo #wpforo-wrap {margin-left:200px;} gives me a margin but not the grey fill

I had an idea and did a new install of wpForo, activated on the root domain then I replaced the Themes folder with the same folder from the new install but it made no difference so I figure the problem is not in there. Any other ideas I can try?

BTW, that inspect code above, is not having any effect today. In other words, there is no left margin with it in and none with it out.