[José M. Villar]

Do not worry, I don’t understand it either.
To have standalone forums, you have to mess with a standalone bbP installation, which I think will be less integrated than the default groups+forums setup.

I am not sure, but with previous BP versions you could have standalone forums AND group forums, visualized all together. How I miss those days…
Several coders such as @nuprn1 and @sbrajesh have expressed intentions of developing plugins/hacks for standalone forums for the actual BP versions.