Missing tag function

Nextcloud version: 14.0.3
Operating system and version: Ubuntu 18.04.1 LTS
Apache or nginx version: Apache 2.4.29
PHP version: 7.2.10

The issue you are facing:
I wanted to categorize my data using tags. But there is no chance to add them, because everything concerning tags is just missing as if the feature was turned off. I tried solving the problem with searching the forum and Google as well as searching for an option in the Admin area. But I didn’t find anything. Maybe I am just missing something? The manual does not say something about disabling tags.
I can’t tell whether they were missing before the update to 14.0.3, because I did not care about tags back then.

Is this the first time you’ve seen this error? : Yes

Steps to replicate it:

  1. Open a file to “Details” view in Browser
  2. No option to enter tags
  3. No filter option on the left side

config.php


<?php
$CONFIG = array (
  'instanceid' => 'ocepxuukfjkh',
  'passwordsalt' => 'bla',
  'secret' => 'bla',
  'trusted_domains' =>
  array (
    0 => '192.168.0.9',
    1 => 'example.com',
  ),
  'datadirectory' => '/data',
  'overwrite.cli.url' => 'http://192.168.0.9',
  'dbtype' => 'mysql',
  'version' => '14.0.3.0',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost:443',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'nextcloud',
  'dbpassword' => bla',
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'maintenance' => false,
  'defaultapp' => '4',
  'knowledgebaseenabled' => true,
  'enable_previews' => true,
  'preview_max_x' => 256,
  'preview_max_y' => 256,
  'theme' => '',
  'loglevel' => 1,
  'logfile' => 'nextcloud.log',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'filelocking.enabled' => true,
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => 'localhost',
    'port' => 6379,
    'timeout' => 0.0,
    'password' => 'bla',
  ),
);