class LoginView(RedirectAuthenticatedUserMixin,
                AjaxCapableProcessFormViewMixin,
                FormView):
    form_class = LoginForm
    template_name = "account/login.html"
    success_url = "/"
    redirect_field_name = "next"
    # ....

class SignupView(RedirectAuthenticatedUserMixin, CloseableSignupMixin,
                 AjaxCapableProcessFormViewMixin, FormView):
    template_name = "account/signup.html"
    form_class = SignupForm
    redirect_field_name = "next"
    success_url = "/"
    # ....

urlpatterns = [
    path('account/', include('allauth.urls'), name='account'),
    # ....
]

LOGIN_REDIRECT_URL = '/'