Debug Toolbar not working

When I click in a CodeIgniter 4.0.0-rc.1 debug toolbar tab it does nothing. Is this function supposed to work at this development stage? What can I do in order to get it working? I've just extracted the github zip file and changed Apache 2.4 document root to point to the "public" folder as per documentation. The welcome page/view loads fine (no js error, nothing)... but when I click in files tab, for example, nothing happens.