Apache DocumentRoot

Question

I have a Apache installed on Ubuntu 18. Config file /etc/apache2/apache2.conf does not contain DocumentRoot directive. But there is /etc/apache2/sites-enabled/000-default which defines DocumentRoot as /var/www/html. Directory /var/www/html contains index.php file with simple <? phpinfo() ?> but if I try to call servers IP from browser like http://40.69.5.143/ it does not show www/html/index.php but it opens the first directory in /var/www/html and its index.php. I dont understand why it ignores 000-default config file. 000-default looks like:

<VirtualHost *:80>
    # The ServerName directive sets the request scheme, hostname and port that
    # the server uses to identify itself. This is used when creating
    # redirection URLs. In the context of virtual hosts, the ServerName
    # specifies what hostname must appear in the request's Host: header to
    # match this virtual host. For the default virtual host (this file) this
    # value is not decisive as it is used as a last resort host regardless.
    # However, you must set it for any further virtual host explicitly.
    #ServerName www.example.com
ServerAdmin xxx.xxx@xxx.xxx
DocumentRoot /var/www/html

# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn

ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined

# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with &quot;a2disconf&quot;.
#Include conf-available/serve-cgi-bin.conf

</VirtualHost>