I would like to use nextcloud on my server only for Mail & Calendar. How can I disable “Files” for my users?
It’s a basic app, you can’t disable it. On command line via the occ command, try to disable it. If that doesn’t work, you can perhaps just hide it (give each user a quota of 0) and disable the related URLs. But you have to go through the code a bit…
Also you can set the default app to another app than “files” in config/config.php
'defaultapp' => 'appname',
In Nextcloud 20 the default app is the new dashboard.