I can't set up virtual hosts in Apache, although I do everything according to the instructions. What is the reason?

Question

Apache HTTP Server

I'm trying to set up virtual hosts in Apache, and it doesn't work. I follow the instructions without problems, but it does not work.
Ubuntu 18.04. The site's original root directory is /var/www/html
The index.html file is there and is accessible from the web.
Now, if you just type the site address in the browser, then it is still issued, /var/www/html/index.php, and not the index from the virtual host. That is, it turns out that virtual hosts do not work at all.
I did the following:

sudo mkdir -p /var/www/xxxxxx.xx/html
sudo chown -R $USER:$USER /var/www/xxxxxx.xx/html
sudo chmod -R 755 /var/www/xxxxxx.xx

nano /var/www/xxxxxx.xx/html/index.html
Added page code here.

sudo cp /etc/apache2/sites-available/000-default.conf /etc/apache2/sites-available/xxxxxx.xx.conf

sudo nano /etc/apache2/sites-available/xxxxxx.xx.conf

Inserted into it:

<VirtualHost *:80>
ServerAdmin [email protected]
ServerName xxxxxx.xx
ServerAlias www.xxxxxx.xx
DocumentRoot /var/www/xxxxxx.xx/html
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

sudo a2ensite xxxxxx.xx.conf
sudo a2dissite 000-default.conf
sudo systemctl restart apache2

As a result, the rights to directories turned out to be as follows:
[email protected]:/var/www$ ls -l

total 12
drwxr-xr-x 3 root root 4096 Nov 14 11:05 xxxxxx.xx
drwxr-xr-x 13 www-data www-data 4096 Nov 13 16:14 html
drwxr-xr-x 4 user1 user1 4096 Nov 12 11 :03 html-bk

[email protected]:/var/www/xxxxxx.xx$ ls -l

total 4
drwxr-xr-x 2 user1 user1 4096 Nov 14 11:08 html

[email protected]:/var/www/xxxxxx.xx/html$ ls -l

total 4
-rw-rw-r-- 1 user1 user1 177 Nov 14 11:08 index.html

What's wrong? For the first time I set up Apache, nevertheless, according to the instructions, and there were no errors during execution.