Domain Preview

No. Sometime due to some DNS issue website not working on URL so is any way like in cpanel http://IP/~username will show direct website status via panel.

Is any way to do if multiple domain added in OLS?
Oh I think I get what you're saying. What you can do is create a new Listener on a unique port, and then assign your vhost to that listener. It's what I do for domainless things like PHPMyAdmin. So then I can reach it with https://SERVERIP : PORT (spaces added to avoid smiley)

EDIT or this might not be what you mean haha, but it would be a way to temporarily access your site if you need it.