How to enable community document server again

Nextcloud version (eg, 12.0.2): 18.0.1
Operating system and version (eg, Ubuntu 17.04): Debian 4.19.37-5
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38
PHP version (eg, 7.1): PHP 7.3.11-1~deb10u1

I have been playing with OnlyOffice and Community Document Server. I had Community Document Server working, then I tried to switch to OnlyOffice, but I failed to get that working properly.

I want to go back to using Community Document Server, but I don’t know how. Presumably I have to give a different url to the OnlyOffice connector, but I don;t know what.

It’s OK - someone else has told me - it is https://domain.url/index.php/apps/documentserver_community/