does not work. After the configuration from the external Site a blank screen appears.
The Link “Miscellaneous” on the Folder from this modul also dosnt work. The Link shows on dolibarr/admin/externalsite.php but the correct link would be dolibarr/externalsite/admin/externalsite.php
Try to disable the module externalsite then enable it again.
Try also to go into menu home - setup - menu. Change menu handler and go back to the one you used.