Usually when there is a new post by Kourosh Dini, I sit up and take note. This one is no exception.
Tabbed views have become trendy with the release of macOS Sierra and there are many applications utilizing the feature. The beauty of tabbed views in OmniFocus is that it's now easy to separate out your sessions of work and focus.
The best adaptation of this use is definitely provided by Kourosh here and if you are serious about how you use OmniFocus, I can't recommend it enough.