How can toolbars be hidden?

I’d like to hide a specific toolbar of a window. How can this be achieved? eg the toolbar of the Game View window:

I don’t think there’s an official way yet to customize that toolbar and since that toolbar is still using IMGUI, it’s not easy to hack it either.

There used to be a bool called showToolbarProperty to do this, but it was removed for no reason. There are assets in the asset store that can do it, but I don’t know how. So there must be ways to do so still. I’d like to know as well.

It’s confirmed as bug, they fix it.